What I find fails on those is usually the "O" ring or other seals needed for the rotating face plate that changes the pattern. (and I also seem to wear them out and toss 'em)
How about just a more standard brass nozzle?
Otherwise, I have also seen hand held shower type sprayers, on/off kitchen type, and my favorite for years is the garden tank sprayer type (with no wand)
I still use the garden tank sprayer type for developing.