Robyn,

I had my fab guy make this for me a while back, along the lines of what you mentioned. I gave him an old damper bolt (I had chased the threads so it wouldn't damage the crank threads), a nut and a length of all-thread. He TIG welded it together for me.



I would run the 18m bolt all the way into the end of the crankshaft by hand. The problem was that as you get the damper over halfway on, the big washer in this pic butts up against the nut/allthread, so I needed a sleeve to go over that. I thought a short length of PVC pipe would work. I didn't - not strong enough. I should have had a short length of steel pipe. Jim