Hi mazo, I sure admire your effort trying to resurrect abused firearms. However, there are times when the steel used in neglected firearms needs to be recycled to razor blades. Even new BP firearms need attention to have them become accurate and reliable guns. That's the path I travel and always recommend grieving for firearms abused and returning the abused firearms to a more appropriate condition, scrap metal.
While I enjoy and celebrate your efforts, there are however other paths to take.
Regards,
Richard