After reading on Guy's forum that Mark is playing a Grosh guitar, I decided to check out there site, but on there artists page there is no sign of Mark, they don't seem to have any high profile players on there, so was amazed not to see him. So, I contacted the site, and this was the reply:
Hi James - thanks for your email and interest in Grosh! Yes, we are aware that he is playing the ElectraJet and actually just got permission yesterday to list him on our website, which will we be doing very soon!!! I was at the show in Denver on Tuesday and it was AWESOME!!! He played the ElectraJet on the last song and it was really, really cool. I met his manager after the show and they gave us a very nice poster signed by Mark that features the ElectraJet. We are truly honored that he loves the guitar! Thanks again for the email.
7223 W. 118th Place, Unit I
Broomfield, CO 80020