I have a 1976 model Colt 1911 in 38 Super that I picked up at an estate sale. I think that at one time, the gun was fitted with rib, as there are three tapped holes in the top of the slide. I was wondering if it would be possible to tig weld up the holes to fill them and then refinish slide. Would the tig welded spots show thru the bluing finish? Or should I leave well enough alone and let it be?