I just fixed my WC HeadMate last week. I bought the rebuild kit, but the only parts I needed from it turned out to the be the intake flap valves. The metal components had rusted away completely. All in all, it took about 10-15 minutes of work to replace. I took the entire pump assembly apart anyway for inspection and the rest of it was in great shape. I just used some Super Lube on the piston and packing and it put it back together. In the future, I'm going to see if I can just get that one piece.
A new Lavac head sounds great, but is a lot more work and money than just doing the simple rebuild I did on the WC Headmate.
Thats my whole point. Why replace the head mate just because one component may need replaced.
West has the flap valve assembly for $34. Its the forth item down the list PO195-96
Repair Kit for Headmate Head