Just completed cleaning screens in carbs. Started engine and everything was fine until I tried putting flame arestor on engine while engine was running. I accidentally dropped screw into rotary valve intake (through one of the carbs) and engine stopped. Would not turn over as if dead battery. I checked movement of drive shaft and was impossible to move. It was able to move slightly back and forth with vice grips. Anyway, I removed carbs and saw rotary valve bent where screw entered. My question is: What are the chances of me replacing rorary valve and all being O.K. verses the screw being lodged in the crank and total engine redo is needed? I am not a mechanic and have limited ability to fix unless anyone has suggestions. Bottom line....can this thing be fixed either by myself or by mechanic at reasonable price. My seadoo is a 1996 GTX 787 worth about $1500 (last week) Ha ha :( Really need help.