I found a manual for one... I know there are a couple different models out there. Mine is the plastic case one, not the metal one with louvers. Looks like it is really made for free-band, with no instructions on how to make it do 10 meters. There must be a way though. I wonder if ExitThirteen or Unit 399 read the ham posts? They might have the answer on this since they know so much about the 858 chassis.
It's not the end of the world if I can't do it, but I really like the performance of the rig and thought it would be fun and interesting to use on 10 meters. I already have another really clean Grant XL that I can still use for CB.
73,
Brett