I made a nice hole in a clear carto with a dremel. Drilling straight into the carto with a thin diamond point bit.
The carto was a resurrector and had been used already. I don't know if it had been expanded from filling with
juice for a few days but I couldn't get it to fit into an M1A1 Buzztank. Didn't have any new clear resurrectors to try. The diameter of the carto just wouldn't fit into the M1A1 O-ring opening. The metal resurrectors fit fine.
But as far as making the hole goes, dremeling straight in worked fine, no cracks.