Just scored a pair of Faction Prime 1.0 in 184 for a great deal (150 in plastic). Going to mount them with some plum guides and use them for long spring tours. I heard that it was tough to find the right mount point for these, from the Blister review of the 4.0. I'm having trouble finding much beta about the 1.0 and the mount points specifically, and was wondering if anyone had any beta on them