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If the grooves are a too tight, you can relieve them on the upper face of the ring groove by machining, of course it hsa to be done with great precision, but I have done done successfully many times. The upper face is not a functional sealing face, so if the contour is in parallel to the same high degree as when they were made, it's not a huge issue. Is it a desirable op? NO, but if the maker won't accept liability for them, it's better than junking them.
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