Do you mean the sleeve in the middle between the cups? You'd probably be looking at custom fabrication. I did one in aluminium once, to be worthwhile it needs to incorporate o-rings to seal it.
@gbj_tester started
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Do you mean the sleeve in the middle between the cups? You'd probably be looking at custom fabrication. I did one in aluminium once, to be worthwhile it needs to incorporate o-rings to seal it.