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If the lip of the hole has been burnished in, it will have to be removed for the jewel to clear the hole when it is pressed out. This is a perfect application for a face plate on the jewelers lathe. If you do this center the jewel and pilar plate with the plunger center in the face plate. Using a center in the tailstock will work only if it is centered to the spindle of the lathe. in most watchmaker lathes of the WW design, the tailstocks are not centered well to the headstock spindles. You can accurately check the tailstock by running a dial indicator around the tailstock shaft.