I know where your coming from 23, have it set just inside the base end when collapsed, that's where I was thinking of placing mine.
My question is why have a permanent o clip to the gooseneck? The biggest advantage of this over the aquatap and the aquadaptor is that it's inside the pole so it makes changing brush heads a doddle, if using a jg style fitting between the univalve and gooseneck
Darran