In Patrice's picture, you can clearly see the spot weld shadows on the inside of the drum shell around the circumference, as light blue spots.. If you feel them on the originals, they are probably smooth.. On the repro drums, you can fee some slight roughness by using the bullet nose of a cartridge and sliding it around the drum interior same as if it were under pressure? You'll feel little grabs and catches as you go! These must be sanded out to 320 or better, W/D and then buffed, polished to ultra fine... bullets should slide/slip, around like on, "hammered owl snot"
... which must be pretty slick as it is invisible?...
... at least I've never seen it? BTW, polish the interior complete and up the tube while your looking at it....
.... til....lat'r....GT...
