one of the bolt holes used to bolt the starter to my engine block is stripped. i think there's enough space in the clearance holes on the starter to run a 7/16 bolt instead of the 3/8 bolt. of course, i'll check before drilling. now, i've never tapped a hole before. when i run the tap into the block, will it just follow the existing hole so that i drill straight? or is it more difficult? i'm concerned about really messing myself up. thoughts, please.