I have seen some nasty marks made by these. I still use razor blades and case back knife for more control. Heat will help if the gasket has hardened. The crystal has a delrin Gasket sort of like nylon. It goes into a notch in the edge of the crystal and over the lip around the dial on the case. One of the Thunderbird models even uses a delrin ring (and only a delrin ring) to hold on the bezel. The Seadweller models have an inner SS ring and press into the case instead of a metal ring pressed onto the outside of the crystal and gasket. You will need a press to put it back together and preferably a new gasket.
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