First, ask over on Graflex.org for more information. The folks on that forum will know better than anyone about servicing your camera. I think you'd be able to scavenge the parts you want off of another 3 1/4 graflex of similar vintage - there's no reason why the shutter mechanism would have varied from version to version in that size. Another good plus is that the 3 1/4 graflexes are not highly prized, so it should be a small matter to acquire a donor camera for little money.