Glad you mentioned the slide bolts. Many many years ago the nuts on the inside were the nylock nuts. They're not anymore. My 2+2 and this boat I have to keep an eye on the sliders bolts and nuts because they either come loose or tighten up on their own. I called CMC about this and they said the nut on the inside is to be tightened down (locked) against the plate by holding the bolt head on the outside in position AFTER the proper spacing of the nylon and steel washer have been achieved.

And the way you get the right tension on the washers is by tightening or loosening the bolt so the washers can be turned with your fingers but not so loose that they spin freely. I was told the inside plate is threaded where the bolt goes thru and that by turning the bolt it will tighten or loosen the adjustment of the washers. Then you "lock" down the nut against the inside to hold it in place.

I've had my boat sit for a few weeks with the motor trimmed down and if I'm going fishing trim the motor up to put the motor mate on and hit the JP lever down it gives out a load "crack" sound and it's one of the washers letting go because it's too tight. Then I go thru the process all over again checking the tension on all the washers AFTER I sprayed them with WD40 so they are not dry. sucks

I may be all wrong on this but I'm just repeating what I was told by a CMC tech.