[Jacques Reed]

Hi Tony,

Thanks for the offer for the template. At this stage Tony Wheeler is dropping by in the next week or so with his holder for me to get measurements.
I don't have the bolts either but should be able to get enough info off Tony's.
Looks like they are a forging in the photos. If so, will be paying the local blacksmith a visit. If welded to the rivet plate it will be an easy fabrication.

You may be able to get reasonably close brass wingnuts from a ship's chandler/provedore. They look very similar in design to ones I have seen at sea over the years. Doubt the design has changed much in decades.
Brgds,