Proportioning valve re-build

[JOZW30]

72 W30 w/manual disc brakes. Original (cast housing) frame mounted proportioning valve started leaking last spring before my first show. I bought one from Inline Tube, and beside not being able to hook up the electrical connector, it seemed to be fine.

Got my Spring Dust-off show tomorrow, and this morning, the valve basically fails on me. Fluid basically "pumps" out of the little button on the front.

I am using silicone brake fluid, and every component in the system was new.

I would like to just get my original re-built. Anyone have this done or know a reputable place to send it?

I would rather not use another brass billet repop. Got a month now before the next show. Would like to drive the car this year sometime though...........