Re: Alcohol stoves in use?
Halcyon came with a two-burner Origo built into its countertop. It may not be as hot as propane or natural gas, but it boils up a quart of water quick enough to make my morning coffee and my evening meal. Alcohol isn't cheap, but I can buy a whole hull of a lot of alcohol for the price of converting to propane - enough to make the conversion very definitely not-worth-it, at least to me at this time.
Squidd, a piece of inner tube should do fine. I found a sheet of neoprene gasket material at a hardware store - 1/16" thick, 12" x 12" - enough to make four way-oversized gaskets for the top of the fuel-cartridges. I let the stove cool for a while (20 minutes or so) before I open the top of the stove and put on the gasket. It keeps the cartridge very well sealed between uses.
(And I'm still giving very serious thought to a Wallas diesel stove, maybe, someday.)