Re: how to soften cork
When I installed the cork seals, I soaked them in engine oil.
Another item to observe is that back many years ago, the cork seal was shaped with two sides longer than the other, not square. This shape allows the cork to form better between the clam shell and the ball shaped part of the drive shaft. I have them in my car over 20 years and no leaks. Just my 2 cents worth.
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