most of the time you would use a puller... do you have a pix of yours, dont understand the ..the other 5/16 holes look like giant nail heads............

had one on my 235 to come off at high way speed, held on by centrifugal force and wood drift key...........some folks have the center drilled out and install correct bolt

Last edited by joker; 10/30/2010 9:43 PM.

Redryder pix
My Hotrod
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