If Douglas doesn't work out, I also have them for $125 shipped, fully refurbed, with 1-year warranty. Includes mesh cover also.
Douglas, you can try replacing the HV diode first, if you have a spare handy. I've found that to be the most likely cause in those cases where it just won't go high enough. (That, and sometimes the springs in the boots getting corroded and going resistive, which burns the boots up.) I clean the boots out in those cases, and solder the wires directly to the new diode, then put the salvaged boots back on.