Talk about quick work....I just installed my boat hoist two weeks ago, and put a cover over the unit. Didn't really need one since it's inside, but I thought it looked better than just having the open motor and hoist unit hanging there. The cover shields the unit from weather, etc., but is still open on one side. Big mistake. Within 30 minutes of finishing the project and putting the cover on, the wrens had a half-built nest in it. Needless to say, the cover came off.