The only help that I can offer is rather belatedly. The Beaulieu Boat Jumble is probably the best place to look for strange/obsolete nautical items. I am always surprised at the range of items on display there. Unfortunatly it has just been (mid April) so perhaps a search at alternative sites may turn something up. Personally I think Beaulieu is the best as it has been going for thirty years or more to my limited knowlege. It is certainly worth going to next year and doing a serious search also asking some of the more specialised stallholders as they are more than often very happy to help or at least point you in the right direction. Good luck with your search from Swyn.
"Why,sometimes i've believed as many as six impossible things before breakfast"
The White Queen. Alice Through the Looking-Glass.