I am looking for a Smith to fix a loose barrel spacer on a Marlin 90 12 ga. O/U. Took it out to Wild Bill's and both of the smith that work for him claim you can't silver solder it. They had no idea where to take it. There only advice was to go the Gun Room and ask the a$$ that runs that place where to take cause he know shotguns. So I figure I would ask hear first before I have to go to the Gun Room. Thanks for the help.