For anyone looking at this 6203 according to spareparts.astralpool.com/PDF/903_8.PDF (Part 19)

i know its no use to you anymore but, for anybody else its normal thread, right hand, counter clockwise to remove. Just got make sure you can hold the shaft still, if you hold the rear fan and try the shaft will spin, need to takle off the sirclip and get a shifter on the flat of the shaft.

In all fairness... removing the wet side is pretty straight forward. The Impeller unscrews in the opposite thread. And the electronics box comes off the top with a few screws. It would be worth mentioning it's a good idea to replace the mechanical seal.