Just to shed some light on the initial question of how much “slop” is there… I measured 4 mag plates and four crankcases. Now understand that these were all used parts, but none appeared to be severely worn or abused. Here are the results
Mag plate brass bushing I. D. 1.6910 , 1.6915, 1.6910, 1.6909 average 1.6911
C’ case hub 1.6870, 1.687, 1.688, 1.686 … average 1.687
So on average the clearance is 0.004″ worst case 0.0055″
I guess that in worst case the .020 point gap could be affected in the range of .015 to .025.
Joe B
