I have an old Herters .22 SA revolver (made in mid 60's) and it had a rib on the top of the barrel with the front sight attachet to it. The rib was held on by one screw up near the front sight. Well the rib broke at the screw and the rib fell off several years ago and I just put the darn thing away but now thinking of maybe fixing it back up again. Can anyone here tell me what kind of glue or cement is used to do that? You can tell from the residue that it was cemented on when it was made. Thanks in advance.