one barrel spacer at the end of the inner barrel. done.
The hop chamber holds one end of the barrel, spacer supports the other end.
The hop chamber isn't sturdy enough to hold the barrel in place to any sort of repeatability on it's own.
But don't be an idiot and fill the outer barrel with spacers either, that will contort the inner barrel to the outer barrel.
Just support it at two places and that's perfect
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