I would not fear a great deal of about the fin on the bottom, just seal it up so it won't leak. Ironically I welded up a lower unit just two times in the past. Guy hit a rock and punched a hole within the front of his unit, dug https://jaidenajqnv.luwebs.com/32135197/5-easy-facts-about-how-to-repair-lower-unit-on-mercury-outboard-described