The first gun is a late type of Iver Johnson top-break, a Model 67 .22 target revolver from the 1950's-60's. It is in excellent condition externally, but when shooting, it misfires at least half the time due to the cylinder not advancing and the hammer striking the previously fired cartridge case. The second is an Astra Cadix, an inexpensive J-frame sized revolver from the 1960's. It is a 38 Special with a 4-inch barrel and adjustable sights. (I got it because S&W never made a 38 Special Kit Gun, and this was the closest I could find.) It has exactly the same problem, but less often, maybe 1 time out of 3 or 4. In both guns the cylinder ratchet looks good, although the cuts on the Iver Johnson ratchet are kind of shallow - it is an 8 shot gun. I assume the problem with both is the hand, although I am very much NOT a gunsmith. Is this an expensive problem to get fixed? How hard is it to find gunsmiths who will work on forgotten models like these? Is it worth doing with guns of modest value like these? The Cadix is a lot like an S&W externally and has a sideplate, but the internal mechanism is different. I removed the sideplate and cleaned and oiled the innards after discovering the problem, but it didn't help. The IJ has no sideplate - everything is inserted from below and pinned in, I guess. I oiled it as best I could, but also to no effect. On both of them, when they DO fire, they do no spit lead, which kind of confuses me about the problem. Any thoughts would be appreciated.