If you've got a head you can't get parts for, the Jabsco heads are quite inexpensive these days, under $200, many rebuild kits run upwards of $50 so the difference isn't all that much and you get something new. Not the quality of a good Raritan, or others, but certainly servicable.
We're off to Bowen Island tomorrow, will keep an eye out for you on the Bay Sunday (if you get out there!)
btw- nice job on the sink drain... using expensive hose too!!
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)