Sounds like you are putting way too much torque on them, if you continue eventually your washers are going to mush out sideways until they are jammed tight in the bore.
If they are not leaking then leave them be, if they are leaking you may need to disassemble and check for any foreign material or burrs on the sealing surfaces.
Copper expands more than steel when it warms up and contracts accordingly which makes it an ideal material when properly torqued for your application.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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