Re: outdrive locknuts?
What beach? I'm right next to Nashua, i'll be there in 45 minutes, and i'll have that drive off in 60 seconds making a complete racket using my cordless impact
All kidding aside, i've seen the locknuts and not a fan of them. They get chewed up, people lose keys, i've even seen people put non stainless steel ones on that are a nightmare to remove after sitting in salt for 3 months.
If your boats on a trailer, 1 thing you can try is trimming the drive all the way in, then wrap the whole drive with a heavy chain and padlock it to the trailer. After that bump the trim up so the chain appears taut. When you want to go boating, remove the chain.
Sure the chain can be cut, but the novice theif will probably look past your boat to 1 that doesn't look like its a hassle.
What beach are you worried about theft?
ps~ Who does your service work?