Remington tang sight screw

[apprentice]

I just purchased a Remington 81 and also found a Lyman tang sight for it but the sight did not have the mount screw for it. Does anybody happen to know what size screw is needed to mount the sight? It looks like an 8-40 but I wasn't sure. Also does anyone know where to get a Marbles sight blank for the 81. I have seen them in the past but can't seem to find one now.

[huber jay]

Look in the parts and repair section of this site. Jay Huber RSA

[apprentice]

I have been scouring the parts section with no luck. Anybody out there happen to know the answers to these questions? The mounting screw for the sight would be great.