There's a simple way to enlarge a hole in the oil pan to make it big enough to insert a rivet without drilling- - - - -use an ice pick, an awl, or a tapered punch. No shavings, and no danger of bearing damage. Pop a steel river into the hole, clean up and sand the outside, and lay on a layer of sealer.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!