Okay Bob ....got it figured out now. I'll try to attach a couple of photos, My 44 HUP has the large cannister as in your photograph in exactly the same spot. My 43 HUP has the smaller cannister placed on the frame as you have mentioned. I have not tried to change the filter as of yet....but your reference to "bitch" excites me to no end

. So that leaves the Cab 12 which we will do do changes to. I'm pretty sure Grant Hopkins over on the island has a couple of spares that I can utilise.
Well ...there you go again, can't download the photos

Anyway you got my drift Bob.
Thanks again....Robert