I think a ream is the better tool to make the hole, rather than relying on a drill bit. Either borrow one from an obliging engineer or buy one and hire it out to everyone else on here... expensive, but it makes a far more accurate round hole than a drill bit.

 

..or though, thinking about that, maybe you need a crappy shaped hole to have little pockets of grease in there to keep it lubricated. LoveKE's hardened bolts will work fine for the next 30years.

spose I can't loose for $17 ill get them and see what happens,

 

cheers guys

Edited July 10, 201214 yr by mdw003