Hi all. Requesting your forbearance on a newbie question, but aside from 6 nylon screws and some friction, what else holds that bow thruster prop in place? I see on the photos and diagrams that there's a pin that looks to hold the inner piece in place, but does it hold the prop too? I've just been leery about putting any appreciable force on it, but I'm puzzled here. It looks so simple :) ... but then, all the great mysteries start out that way. Gary W. SM 209 "Adagio"