rossi 22 scope mount

[r_p_bayly]

am trying to mount a b-square scope mount on a rossi model 62 gallery gun (22-s/l/lr). This is similar to the shotgun aftermarket saddle mounts.
B-square sent me the proper new screw to replace the original takedown screw in the receiver. The new screw is about 0.10" longer than the original screw to allow for the thickness of the mount side plate.
My problem is how to get the original takedown screw out. It has a very small pin thru the threads that prevents it from coming our thru the bushing in the receiver. This pin is partially blocked by the bushing which prevents getting a punch in line with it.
How can I get this pin out?

 

[paul salchow]

pin

That little pin comes out, it helps if you have extra fingers but it just drives out.
Than you can remove the take down screw and replace it, just reinstall the pin in the new screw.