The serial number was not given. This is an important thing to know before any further diagnosis can be done without opening the body. There were 3 different designs of the baffle dampening system. The one from 1958 to about 1970 was particularly troublesome, due to a rubber part that decomposes. This is directly linked to the lubrication in the hub of the half gear that winds the film. In essence, the camera has "jumped timing". Any tinkering, particularly any tinkering that allows the mechanism to cycle backwards to unjam the works can and probably will cause a very tiny spring deep within the works to become damaged. At this point you will have a very bad problem requiring replacement of said spring in an era where parts are not available. Don't fool with this camera another minute. Send it out. As it is, your camera has not suffered any problem that cannot be repaired without needing new parts. But if you fool with it any more, it will.