Sometime you can get the pin out if you soak the hole with penetrating oil, then put it in the freezer for a couple of days, then take out let it come back to room temps. Then put it on a lead block with a patch over the part to protect the finish. You can heat up the outside of the link with a hair dryer to expand it before the pin gets expanded much. Then an automatic center punch with the proper size end can be used to punch it loose. I have used all the tricks GT used, heck, he probably taught them to me and because I am an old fart I furget. I too did all right in College Chemistry and GTs explaination hit home again.
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