[Tubesforme]

Hello,
I have read several articles regarding re-stuffing the MERSHON copper condensers. I have tried to remove the top cap on a couple of old ones, before I do the two that I need. I was not able to get the tops off without either denting or scratching the can, using a screw driver. I was also not able to loosen the tops using a small piece of wood with the hammer. I also read that you can cut them open, but I don't care to do that. I would like to know how some of you open them. How do you hold them while tapping off the top cap? How do you tap off the top cap without scratching or denting the top or can? They polished up beautifully with Brass Polish and they do set the radio chassis off. I do not care to install the replacement capacitors under the chassis. Any good ideas? Thanks to anyone who has an answer.