Why not try this...cut crank off a little over 3/8 inch past the aluminum boss with 2 holes in it. Make a 3/8 x 1 bushing with a hole to fit crank. The boss would be a good place to mount sensor. You could use a set screw to hold bushing in place. That would make timing easy to set. Then again...it may not work. Just a idea!!!! Capt,n