Oups, just saw on the picture that you already have I made one out of three layers of bicycle rubber. I dont think ot will work tho as the pressure is probably too high. I cant tighten it too much. Better that you reach out for the 3mm oil resistant rubber...no problem since.
Cheers, Georges
M3W, Super Dry edition, sep. 2013 ...called 'DogNose'
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