Info on Spellman PCM series high voltage power supply

I'm looking for information on how to enable the variable current limit on this power supply. The one I have is fixed even with the built-in pot wired up as in the manual at the Spellman Web site:

There should be a way to make it variable, probably adding or moving a resistor but the circuit board markings are no help.

Any info appreciated. I've beent to the Spellman Web site and sent them a request for assitance twice with no reply.

Thanks.

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