Adjustable front sight on 1915 well used Arty

[Mauser720]

Jack -

I'm not sure anyone has responded to your question about where to "tap" on the sight to free it up the fine tuning screw.

I've had good luck applying Liquid Wrench to the sight and the screw, and then tapping on the top of the screw itself. Supposedly this sets up vibrations in the steel which help the solution to pentrate the gummed up areas.

I'm not sure if a wooden dowel rod or a nylon drifting punch is firm enough to set up such vibrations. If the finish is completely gone, then your only concern is to not mar the bare steel.

If you have a ordinary pin punch of the right size with a flat tip, I'd gently try that. If you don't have these punches, then you can make one out of an ordinary nail of the right size, with the sharp tip ground flat.

The challenge is to tap on the top of this screw without maring the finish, or the metal, etc.

And as everyone is pointing out, whatever you use, let it soak for a while. No need to be in a hurry. (Maybe I am too cautious, but I let mine soak overnight.)

I have several of these spanner screw drivers, and on some of them the little metal protusions are fragile, in my opinion.

However, I have used Liquid Wrench successfully, and never broken a single spanner either.

Please let us know what works for you, because I know we are all interested.

Ron