The 8500 crank is larger dia, but the same length.
And your right, the 8500 used a different drum, race and brg because of the different dia.
this may be a dumb question/answer to my question but you need a left hand thread tap/die to run down the threads correct?
what i am doing now is using a lot of oil and slowly going down farther and back off each time i screw the drive plate on, it seems to be going down a little more each time, also the drive plate was only rubbing just enough to make shavings. i will report back soon.
thanks guys this one has be stumped,