Hi Evie,
I think this is definitely one to talk to Cookson about. They only have one reviewer, who seems perfectly happy, but as with the other members above, I worry about the metal fins and the Vaseline contamination.
As an alternative, black rubber barrels have caused discolouration too, presumably if the rubber deteriorates, but black plastic barrels with plastic fins seem to work fine. However I found plain plastic lids difficult to manage so I think you still need a metal lid with a closing screw.
Lastly as you no doubt know, the needles in the shot cause tiny pin marks, so you will never get a mirror shine. Dennis.
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