I am replacing my front engine mount with the 13-505 Prothane bushing. I noticed that the bolt that passes thru the bushing sleeve is considerably smaller than the hole in the bushing sleeve. The stock mount that was removed had the same sized hole as the prothane I am installing. Is this normal? Should there be that much play between the bolt and the prothane bushing sleeve? Should I drill out the bracket to accept a larger bolt that fits the bushing hole? Thanks