I've just replaced the pot and flow control rod on mine and it was a very cheap fix. You can get them directly from LEE, or Midway UK have a selection of spare parts. I will say that the pot and rod are from the newer version of the production pot and are slightly different in size, but Lee assured me they would work just fine, with a little adjustment. Well they were right, except I had to make 2 new brackets (P clips) for the flow control rod lever, but it only took a few minutes (used brass) I have also replaced the heating coil and thermostat and it's now as good as new. I think it cost me a total of around £15.00 incl the p&p (I got some parts from LEE and some from Midway UK
Mine is the older type with the rectangular pot support body that houses the switch, thermostat etc, not the newer type with the hexagonal (I think ) body.
Hope this is of some use.

All the best
Baz