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If I use nuts and bolts, is there room to reach below to thread the nuts?
Depends entirely on what kind of boat you have, and if there is a hatch near the location for your install that would allow thru-bolting. I always try to use thru-bolted SS bolts and locking-type nuts for best holding power. I also like to use a backing plate (aluminum or poly) beneath the Ram ball mounts for maximum strength, since it is extremely unlikely this would ever pull out. However, well nuts have a very mixed record and I would never use these unless it was a very unusual type of mounting. Here are a couple of pics of some of my setups.
