if you have a spare cam cog, you can make an adapter pretty easily. I used an old short bolt with 17mm nut/head and tightened it in the centre hole. I fitted 4 M6 bolts to each of the holes so if cam cog was mounted on a cam shaft , the stud part would face forward. I mate the two flat faces together, aligning studs and use a 17mm socket on a wrench to tension up the belts. Unfortunately standard torque wrenches do not work or should not be made to torque the other way to tighten up right hand threads. If you have a torque wrench that is meant to work both ways - all well and good - you can get correct tension on belts. No pic as I believe I have run out of photo credit in here, and, I pinch the cam wheel to weld to a lawn/ground coring tool I made of same diameter. I drive the corer with the 17mm end of my cross bar wheel brace . It was all I had at the time ha ha