Gas tank help

I have had to salvage tanks that were in poor condition and were not easily replaced when playing with British motorcycles. Be extremely careful when using solvents that might be flammable! There are prep/cleaners made for the job, creem is one brand we used a lot. The "handful of nuts and bolts" or chain or even rocks does work. I would inspect the tank very carefully for pinholes or rust spots before I put much effort into a tank that can be replaced for under $200. Try finding a replacement tank for a Royal Enfield Interceptor!