I´m on holiday right now, I´ll try to find it somewhere though. It is absolutely no problem to do the conversion. You´ll have to remove the trigger capacitor of the unit. It was placed in the plug in early units, later they put it in the heads because of the wires mechanical fell off the capacitors after some time in the plug. There is one other important thing, if you intend to use this head with grafit or scoro packs, move or similar: You´ll need to check the flash tubes. If they have three electrodes (not counting the trigger) be careful, they might exceed the max. current draw these units are rated for, resulting in an expensive damage of the cut-off boards. If you have a grafit pack it is easy to check though. Just let me know.
Cheers, Ulf