Thanks for the swift replies, love this forum.
Unfortunately he has had and just sold an rx75, he said something about it kept locking when he was using it and hasn't the dexterity to unlock it.
I'm assuming the presa 40w isn't being made now?
https://www.fasttech.com/search?presa
Appears they're the same price/slight increase in price as the 75/100w versions now, at least on FT.