Sinar F2 -> C Conversion?

I've managed to scrounge a P-series rear standard bearer and I have a P-series rear standard and ground glass... Everything looks great until I mount the bearer on the rail of my F2... With everything on the rear bearer zero'ed, it has the rear standard offset well to the right of the center of the rail and the front F2 standard and bearer (which are centered over the rail).

First... is there a way to make this rear standard work on my F? And if so, what I'm I doing wrong? SOMETHING is clearly awry!!

Thx,
Brady

wrong zero, that's an 8x10 rear standard, you need to use one of the other dots, can't remember which one, but it would be in the Sinar Manual.