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Gasket tankless hot water
I have a tankless hot water coil in a 1980s American Standard boiler.
The coil plate was leaking fairly steadily, so I took it off to find not much of a gasket left, one stripped bolt and one broken bolt (which I broke, of course).
I drilled and retapped and bought some nice new bolts, only to find that the gaskets are unattainable and no place offering gasket material sturdy enough to hold up.
I am on my third attempt: Number One, a modified gasket from a local heating supply company couldn't withstand my modifications and got chewed up when I bolted it down. Number Two, a better designed gasket taken from a pattern meticulously traced from the actual plate, performed even worse – possibly because it was only a 3/16 silicone affair.
How thick should the new gasket be, what material should I use and where do I buy it?
I tried to search this on the Wall, but couldn't find any thing.
Thanks very much,