1985 BHM in changing the prop I noticed the wedges between the fiberglass keel and the outer bearing holder are rooted out. They were wood. And making new wedges I can not tighten the top nuts. Two questions. 1. Why are they wood and not stainless? Like meat issue or isolating bottom paint from anode? 2. I think to tighten them I need to drill a hole saw through the keel to hold the bolts inside the keel and tighten them re-fiberglass the hole saw plug back into the keel. But I was thinking if I could drill a hole in each bolt beyond the nut (towards the prop) I could drive a drift pin in the hole and tighten the nut without cutting the fiberglass. Any advice out there?