I can see why PAR uses T&D over Jessel, i bought a set of T&D pros from a fellow racer here on RJ and they are nice. But before that i tried to get imfo from Jessel as to what offset i needed for the bodix 10 RPSP S/BLK heads that i had, all they did was give me a run around and wouldn't/couldn't tell me which setup i needed for these heads. The RJ person i bought the rockers from sent them to me to check out, it turned out i needed .250 offset which these were. I then called T&D about the setup and how to get started since my heads were already together and i could use their fixture. The tech spend atleast 15 min. explaining how to get there and sent me 2 sets of shims .030 and .060 to make sure that i was able get the right geometry and keep the roller oil holes lined up. I'll definately buy T&D in the future just from their customer service.
JMO
Zip.