K frame sight adjustment screw

[Narragansett]

I have a 1950 K38 that needs to have the rear sight blade replaced. Slightly dinged in shipping. To be original I need the flat sight adjustment screw
. Where do I get that? All I see are the domed screws.

Is it possible to back out the existing screw by going forwards and backwards bit by bit? Thereby saving it?

Thanks

 

[mmande]

This is what I have done to save that part:
On the end with the slotted nut use a drill bit small enough to just barely drill out the upset end that holds it to the slotted nut. Remove the slotted nut with a split screwdriver that catches the notches. Of course this is easier to do with the sight removed from the gun. You can then remove the flat head screw with the blade attached (watch out for the flying spring loaded ball on that end). By carefully chamfering the threads on the drilled end make sure you can thread the slotted nut back onto the stem. You will have to figure a way to hold the slotted nut, but I then file the side without the slots so it becomes thinner giving you more room to stake the threads back into the nut after assembly. Remember the flat head screw threads are courser than the domed head ones so you have to reuse the slotted nut.
If you have never taken a sight apart before I know this sounds complicated but it works.
Mike

 

[Hondo44]

Mike's approach can work well.

The first thing I try before drilling is to clear the slot in the nut. Most of the 'staking' to lock the nut on is the metal that 'upsets' into the inner ends of the slot. With a very small screwdriver or punch with the tip ground square to fit the slot in the nut and very small hammer, I clean the 'staked' metal from the slots. This does most of the locking of the nut in place. Then I try turning the screw.

Be sure to use some lubrication like Breakfree when attempting to screw the nut off, it makes a big difference in being successful.

If the nut still doesn't budge I drill it slightly and try again. The more metal you leave on the staked end of the adjustment screw, the better it will look when reassembled.

The peening of the lock nut varies quite a bit from gun to gun. Some are much easier to remove and re-use than others.

The other method is to file the head of the replacement screw flat, polish it, and then re-blue it.