Well I finally wrenched the cartridge out with a pair of mole grips and applied a tiny amount of Vaseline to the o-ring.
I put a new pre-filled cartridge in and put it all back together (had to re-connect all the JG connectors as I'd removed them to use to pull the cartridge)
Finally I'm making water TDS2 is 14 (normal for me) TDS 1 is 2 though with a new cartridge?
I managed to get the cap off the bottom of the re-fillable cartridge (didn't know whether to remove the top or bottom at first)
Filled it with resin (don't know how much to put in - just tried to pack it in hard)
Anyway, I might get out of the house by 11:30
I'm having almost daily problems with WFP, countless emails and phone calls, plus I'm using a cartridge every 3 weeks.
Missing my ladder and bucket days