Repairing a buggered up slotted screw head

We've all done it. A slip of a blade screw driver and there goes the slot on the screw head.....BUGGERED! Ultimately you may want a new screw but sometimes you can't find a replacement locally and you'll need to mail ordered one. The wait time plus shipping cost for a single screw may cause you to look for a quicker, cheaper solution. You can temporarily ease the pain of living with a buggered up screw with a spare 30 minutes and some simple tools.

Ripper explained it first in the springer discussion forum, thought I'd show you how it's done.

Here's a pretty messed up screw I dug out of my nuts 'n bolts can.

1.1616355063.JPG


Start by placing the screw in a vice so the underside of the screw head lays on the top of the vice jaws. Tighten the vice just until the jaws make contact with the screw threads. You don't want to damage the threads by making the vice too tight. Using a hammer tap on the screw head to flatten down any high pieces of metal. Tap in a direction that forces the metal back to where it came from. If the slot is really opened up, strike the top of the screw head with a little more force to squeeze the slot back together.

2.1616355080.JPG


Chuck the screw in a drill press or hand held drill (not too tightly) and spin the screw head against a piece of medium grit sand paper on a block until the screw head is fairly smooth. Be sure to move the sand paper around under the screw head while it spins. You'll end up with a nice concentric pattern of sanding marks.

3.1616355094.JPG


This is about enough sanding with the medium grit paper.

4.1616355116.JPG


You can dress up the slot in the screw head with a hack saw but I prefer these cheap little jeweler's files.

5.1616355158.JPG


Hold the screw securely in the vice and using straight back and forth motions, dress up (square up) the slot. Go slow and gentle. Let the file do the work.

5.5.1616355139.JPG


Chuck the screw in the drill again and spin the screw head against a piece of fine grit sand paper. No need for a block behind the paper this time, hold the paper in your fingers. Remove the screw and check the head. You may repeat any or all of the above steps until you are satisfied.

6.1616355174.JPG


Time for a little cold blue. Results will depend on how badly buggered up the screw head was in the first place. You may still want to replace the screw but until you do, this is much easier to live with the way it looks now.

Hint: If the screw is in a location where the surface won't be subject to wear by contact, you can use a black permanent marker if you don't have a bottle or tube of gun blue.

7.1616355180.JPG

 
 I just mentioned it yesterday on how to do that. A guy was talking about him buggering up his screw on his HW 50.I have done that for many years. Everybody else was saying buy a new screw. You don’t always have to buy a new one. It really depends on how bad the screw is messed up. And then sometimes you have those weird specialty screws that you can’t find in hardware stores. So then you have to pay top money From the air gun company that you bought it from. I just noticed that you commented at the end on that post that I was talking about yesterday. It’s funny how people know how to take apart their PCP airguns and make parts for them and repair them but don’t want to bother fixing a simple screw. 
 
Nice bit of useful information, r1lover!

The screw in the vice/hammer trick works for allen heads (hex drive) as well. Although I use a flat punch on the cap.It restores the hex shape.

@FelixS A visual aid would help me understand your method better. I ran into this issue with a stripped out hex head screw stuck in the rifle. Ended trying to file a flat head slot with those jeweler type hobby files. That didn’t work too well. So I ended up cutting new slots with a dremel tool and removing it with a flathead screwdriver. Would your method work for a fouled screw still in the gun?
 
Why not just convert those slot head over to hex head screws, that is thr firstvthing I do on my guns. The hex drive is harder to bugger, and the hex screws/ bolts are normally a better quality screw. As a retired toolmaker, I think the hex gives a more professional appearance. If you choose to stick with slotted head screws, then get a good set of hollow ground screwdriver bits and choose the one that fits the slot with little or no play. The excess play is what causes the screwdriver to slip in the slot...
 
Why not just convert those slot head over to hex head screws, that is thr firstvthing I do on my guns. The hex drive is harder to bugger, and the hex screws/ bolts are normally a better quality screw. As a retired toolmaker, I think the hex gives a more professional appearance. If you choose to stick with slotted head screws, then get a good set of hollow ground screwdriver bits and choose the one that fits the slot with little or no play. The excess play is what causes the screwdriver to slip in the slot...

Since guns have been mass-produced, Slotted head screws have been used. I think hex-head replacements would be unsightly on classic looking guns. For modern looking guns, capscrews are prolly best.

As an aside: High Quality guns usually had very thin screw slots all aligned horizontally on the gun, indicating a hand assembled gun by a quality gunsmith. The way it was done in the olden days for “best quality” guns was this: Guns were first assembled “in the white”, final fitted, and test fired. These guns used special “try screws” with thicker heads and normal slots. After final fitting and testing, the heads ground down and slots recut in correct alignment for each location. Then all parts including screws were polished and blued. It takes very thin gunsmithing screwdriver heads to work with them, and it helps to use liquid wrench or WD40 on them before attempting to loosen these fine-slot screws, and tap on the driver handle while twisting to loosen them.
 
Nice post R1lover! about exactly what I was taught decades ago in shop class. One thing I do differently is I skip the cold-blue, since its not longlasting and tends to rust. Instead I reclampby the threads, then apply heat with a propane torch to the head after polishing … it will soon change color to straw, then blue … when blue, dunk in oil (I prefer Castor oil).

The heatblue finish is very attractive and durable, and more rust resistant than cold blue.