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Yeah, I recall that the one I encountered was made to use the can material as the shim stock. You can buy steel and brass shim stock from engineering supplies outfits by the sheet or the pack,...

What material? Mate was making them out of Lion Red cans. Not sure if it had to be Lion Red, but that's what he used. Note he refused to participate in the act of emptying the cans... The method...

No, and likely not accurate enough. Ideally a socket and thermocouple in through the side of the pan into the molten puddle would give you the most reliable reading - I've used a laser in the past...

It is possible to rescue some batches when things get outta whack, but it can be a pain in the arse. Powdered tin is available off places like trademe or craft outfits, it's cheaper than 50/50...