George,

I put them on the regular way and have had no problem. You don't
really need to (nor should you) crank the cam tightener down as hard as
you can. You just snug it up enough so that there is no belt
vibration. There really isnt that much lateral pressure. The motor
shaft problems that you may have heard about were on the Leisen
(spelling) variable speed motors. For some unknown reason those had a
groove in the shaft just outside the motor housing. That caused a weak
point and thus possibility of failure (at least that seemed to be the
consensus).

Larry