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There are lots of different treatments that can be done to long pips to make it weirder, like boiling it, dipping it in chemicals, etc. The point is to either enlarge the pip structure, or make the pips more slippery, or both。Maybe they do this to warm up the rubber and glue before removing it? Previously, very sticky rubber glue was rolled off the lining with an iron.
Tony, who are the vets?