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August 14, 2021
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Believe it or not I can’t find the screw anywhere online. Does anybody know if it’s a 4-40?
January 20, 2023
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Steve, are you talking about the long screw that travels vertically to move the bridge up and down and is operated by the elevation knob?
If so, give 24 hours and I can measure and determine the pitch of the one on my Lyman 48 WJS. It has got to be the same stock.
I had a steel 57 here for months but now it’s gone.
Bill
- Bill
WACA # 65205; life member, NRA; member, TGCA; member, TSRA; amateur preservationist
"I have seen wicked men and fools, a great many of both, and I believe they both get paid in the end, but the fools first." -- David Balfour, narrator and protagonist of the novel, Kidnapped, by Robert Louis Stevenson.
January 20, 2023
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What I’m suggesting is, once you get the size and pitch figured out, Brownell’s should have screw stock and a die isn’t very expensive. If it needs to be hardened that can be done well enough with a torch and can of oil. Tedious but I once had to make receiver screws for a Savage 99 and it wasn’t too hard.
Bill
- Bill
WACA # 65205; life member, NRA; member, TGCA; member, TSRA; amateur preservationist
"I have seen wicked men and fools, a great many of both, and I believe they both get paid in the end, but the fools first." -- David Balfour, narrator and protagonist of the novel, Kidnapped, by Robert Louis Stevenson.
August 14, 2021
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No Bill, I need the small screw that holds the silver elevation plate to the sight. I’ll look for a picture.
August 14, 2021
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January 20, 2023
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Steve, that should be easier. I don’t have a 57 on hand but I do have some others. Let me see if we cant narrow it down.
- Bill
WACA # 65205; life member, NRA; member, TGCA; member, TSRA; amateur preservationist
"I have seen wicked men and fools, a great many of both, and I believe they both get paid in the end, but the fools first." -- David Balfour, narrator and protagonist of the novel, Kidnapped, by Robert Louis Stevenson.
August 14, 2021
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Thank you partner.
January 20, 2023
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Well, so far I’m getting nowhere. I rooted around in my parts box and found a Lyman 48 missing some things. I pulled the elevation pointer screw, which is impossibly small, and the elevation adjustment knob attachment screw that is larger but I don’t think either is a match. Both are too small for my Starrett pitch gauge. In the photo, i included a 6-48 from my Pachmayr screw kit for comparison. I think the knob attachment screw is smaller than a #4 but not sure.
I’m not done looking but I have the uneasy feeling it may take some sort of jeweler or instrument repair screw kit with an assortment of #2 and #4 screws with various heads, to find a replacement. I had hell getting the index screw back in place with my instrument screw set. Too much caffeine. I don’t think I could make anything that small anymore!
Bill
- Bill
WACA # 65205; life member, NRA; member, TGCA; member, TSRA; amateur preservationist
"I have seen wicked men and fools, a great many of both, and I believe they both get paid in the end, but the fools first." -- David Balfour, narrator and protagonist of the novel, Kidnapped, by Robert Louis Stevenson.
January 20, 2023
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Steve, I believe the mystery is solved. I have in my small assortment of receiver sights a Lyman 66, a code W77 for the Winchester Model 77 .22 automatic.
As you can see, the elevation plate is the same as for your 57 and the attachment screw head appears to be the same size.
I removed the screw and using a set of SAE screw gauges determined that screw is a #3-56 TPI. Its hard to believe they aren’t the same. can’t spare the screw on my 66 but it should not be hard to get one or a small assortment from Amazon, Brownell’s or Midway, although I would ask for assistance from Brownell’s first. They are more likely to know what you are specifically looking for.
I hope this helps.
Bill
- Bill
WACA # 65205; life member, NRA; member, TGCA; member, TSRA; amateur preservationist
"I have seen wicked men and fools, a great many of both, and I believe they both get paid in the end, but the fools first." -- David Balfour, narrator and protagonist of the novel, Kidnapped, by Robert Louis Stevenson.
August 14, 2021
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LOL don’t kill yourself Bill. I appreciate your efforts. I know #6 is too big, I tried one. It’s most likely a #4 40 thread. I can get those online, I just didn’t want to buy 100 pcs!
August 14, 2021
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Zebulon said
Steve, I believe the mystery is solved. I have in my small assortment of receiver sights a Lyman 66, a code W77 for the Winchester Model 77 .22 automatic.
As you can see, the elevation plate is the same as for your 57 and the attachment screw head appears to be the same size.
I removed the screw and using a set of SAE screw gauges determined that screw is a #3-56 TPI. Its hard to believe they aren’t the same. can’t spare the screw on my 66 but it should not be hard to get one or a small assortment from Amazon, Brownell’s or Midway, although I would ask for assistance from Brownell’s first. They are more likely to know what you are specifically looking for.
I hope this helps.
Bill
Awesome Bill, never would have guessed 3-56. Much Obliged.
August 14, 2021
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Wait, I think we’re still not on the same page. I need this screw.
January 20, 2023
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We are on the same page. 
The screw you need to hold the shiny elevation plate goes through the plate and into the bridge. In this photo my screw gauge is threaded into the bridge hole where the missing screw goes.
- Bill
WACA # 65205; life member, NRA; member, TGCA; member, TSRA; amateur preservationist
"I have seen wicked men and fools, a great many of both, and I believe they both get paid in the end, but the fools first." -- David Balfour, narrator and protagonist of the novel, Kidnapped, by Robert Louis Stevenson.
August 14, 2021
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You are correct again, my friend. I was blind.
January 20, 2023
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Another view of the screw in question
I believe they are the same screw, which is a #3-56 TPI. I didn’t measure the length, assuming you could cut down as needed. I didnt see anything useful from Amazon. You probably will have to settle for a gunsmithing or instrument repair assortment that contains the one you need. There are industrial supply houses that sell some things in twosies and threesies but likely not this small.
I have Pachmayr’s so-called Master Set, but it’s just a bunch of #6 and #8 screws with various heads. My next step would be to call Brownell’s help line if they still have gunsmiths you can talk to.
- Bill
WACA # 65205; life member, NRA; member, TGCA; member, TSRA; amateur preservationist
"I have seen wicked men and fools, a great many of both, and I believe they both get paid in the end, but the fools first." -- David Balfour, narrator and protagonist of the novel, Kidnapped, by Robert Louis Stevenson.
August 14, 2021
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I emailed Lyman today, I’ll wait to hear back. I can get 3-56 on eBay in the meantime. I reckon 3/16 length should be ok.
January 20, 2023
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I would think so.
- Bill
WACA # 65205; life member, NRA; member, TGCA; member, TSRA; amateur preservationist
"I have seen wicked men and fools, a great many of both, and I believe they both get paid in the end, but the fools first." -- David Balfour, narrator and protagonist of the novel, Kidnapped, by Robert Louis Stevenson.
