I am trying to install a new external BB on my Tracer. Its 73mm and I am using a BB mounted MRP lopes guide. For some reason I can not get my Truvative stylo Cranks to sit perfectly flush to the drive side of the BB. I can get it to sit flush with a spacer on the non drive side, but when I torque it down the cranks wont budge. I know its a spacing issue, and I know the BB i have is meant for 73mm. Any ideas? Also, would running my cranks on the drive side about 3mm non flush with the drive side BB be bad? I am assuming it would. Just curious.