although you will wind up staking the axle nut (DON'T forget) i wouldn't recommend going below suggested specs on this one..

just tighten it to an indicated 65 and then go a little more.. it can't really hurt to be a little off, just so long as you err on the side of a tad too tight..

-adam

ps. have fun, i've done two of these. give the cell a call if you need help. the number is floating around the board somewhere