i tried that. didnt work. the bolt would unthread no matter how tight i would get the jam nut.
So I got a m8 coupling nut, put an m8 bolt thru it (without drilling out the threads) and threaded the end thru the helical gear. This bolt works as the clutch adjuster as it pushes against the ball bearing. Then I welded the coupling nut to the helical gear to keep it from unscrewing. Then I put a box end wrench on the outside end of the coupling bolt (like youre doing) and welded that. It works great. I did change the clutch return spring with a tougher spring for more resistance. Plus, it would be super easy to convert back to normal if I need to. But ive been riding it all summer and havent wanted to change back yet. Let me know if this didnt make sense. or if you want to see some pictures. But, in my opinion, this is the easiest and cleanest diy to convert it to foot clutch