I have just been given a beautifull Dive Knife as a gift, however and unfortunately I had just purchased one. Although I don't dive I have mine strapped to the stainless steel frame over my centre console. Would be ideally suited for the same on your rib or of course your A-Frame. An idea taken from David Manning who, for those who know him is "Mr Safety", he even wears two condoms !!! I can email you a picture as I don't seem to be able to get it to stick on the forum - it's too big. (pic of knife not David wearing 2 condoms) !!
For sale at £40.00. I would be more than happy to post it by courier at my cost once I receive your funds.
Buy it & Use it, then sell it and buy something bigger