my fix for the old SW, off the shelf piston pump, and a bit of machining all electronic
add a pair of o rings and its all go, no leaks, no crapy switch contacts, and should you need a new one $120 nz and you back in bussiness,
add a pair of o rings and its all go, no leaks, no crapy switch contacts, and should you need a new one $120 nz and you back in bussiness,