I've run across a few leather washers and at least one unidentified material where a lead washer goes under the lipstick on my Primus 96 stoves. Earlier this week some string and another I wasn't sure what, flaked like glued or sealed paper where the lead washer would go. Have seen more than one homemade pump cup and leather washer for a fuel cap washer, most of this stuff on my 96's since I mostly acquire those. A couple burner plates that were made from something cast iron and another one or two cut from metal the thickness of a flame plate that a 123 or 8/8R uses. Thinking parts were not readily at hand or available so people made do. Duane
Yes, I have had stoves and lanterns where the seals were made of leather or cardboard and assembled with a liberal coating of a gasket goo. It worked but was a bugger to get apart.