Don't know where I came up with this idea but for the money I'm pretty happy. I went to Ace in the stainless section and got a 6" carriage bolt two fender washers and a wing nut. You may have another spot in mind but I chose the V berth on the passenger side at their feet. I lifted the mattress and drilled a hole about 5" from the edge for the carriage bolt then I slid the bolt thru the hole with the fender washer. On the bottom side with 5 1/2 inches of bolt I placed my spare prop with the other fender washer and wing nut. I also added a drop of removable lock tight. I've been saved by the spare prop once already, I was one day into a two week trip when I spun my prop out, after a 6hr Seatow we discovered the problem and I had my spare prop and tools with me and I was on my way. I've always just had the spare loose under the V berth wedged up against something else, It just bothered me knowing when I was banging over some waves that the spare prop was banging around too. :thup