I haven't, but I do have another board I got from Sam that uses pot feeds. I suppose I should give that a go. Any recommendations what size pot I need? Dunno if ex-servo ones would cut it.
No idea what version of 4QD's these are, I'll have to find out.

On the plus side, Marco has agreed to lend me his Wotty for Newport, but I will want to get the 4QD's running.