The ATFE has prosecuted people for that exact set up above. In one case it was a shoelace. The op handle is now considered the trigger and a single pull of it will allow the gun to fire more than one shot. A gun that is hand cranked is a title 1 firearm according to ATFE thinking unless it is based on the design of the GE minigun then it is still an MG. I guess that they figure everyone with a washing machine would be ripping out their motors or something. Addition of any electronic means of firing makes it an MG if it is a semiauto as it is readily convertable. They have yet to prosecute someone severely handicapped for that as I have seen several write ups on people using solinoids on AR15s and semiauto 22s who could not operate the firearm normally due to severe handicap. I guess they think that that would be very bad PR and would result in questions before Congress.