Yeah, occasionally the HV lead gets so hard that it turns brittle and the suction cup will break apart. If this happens, you can usually replace it with the anode cup/lead from a junked monitor/TV. I forget this exact monitor, but on most color monitors, the anode lead is permanently attached to the flyback, with no good method of replacement, but on black and white monitors, it solders onto the HV diode clip. So, I usually just replace the cracked/hard/brittle HV lead with one clipped from a junk color monitor flyback, or junked TV set.
-Ian