FT has come through with replacement tanks. Various colors for $1.30 each or a variety pack of 7 for $5.93. https://www.fasttech.com/products/3023/10011232/1965503
Nice. Can also be very useful beyond Erlkonigin, such as tanks with Kayfun, Orchid, etc. threading. The OD is a bit smaller, but the ID fits perfectly over these thread rings:
I just did one. Assembled you get a 49mm long tank. Or it can be shortened to whatever you need.
Drifted off topic. But maybe I should be posting this elsewhere...
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