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Boat plug vs. bolt+washer.
Much depends how tight the seals are. You won't know that until you start the extraction process. Some my be much tighter than others.With a boat plug you may get some out,some not. You will get them all out with the bolt+washer.
There are some very detailed write ups listing the exact specs of bolt and washer to use.
Hint the leading washer needs to be as large as possible.I carefully filed down an oversize one using the new tubes as a go/no-go gauge.
The technique is to use leverage not brute force.You do not want to shatter a tube or break anything!
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