Mark originally wanted to make the mount for the legacy lights. I spent a long time on the phone dissueading him from this.
The reason is simple. His mount business is founded on and primarily used by the military.
There are few legacy lights used by the military, and those units using those older lights will not normally be interested in purchasing offset mounts.
He agreed, bought an M9XXXX from Grant and made the offset mount. I have been using mine for 5+ months now, and love it.
There will be an article in next month's SWAT re Weapon Mounted White Lights (read M910 and M9xxx here) and if the editor agrees with my photo choice, there will be some pics of the mount/ ight on a working gun. It will discuss the issue of thumbscrew/ throw levers also.
Blame me for the Offset mount being for the newer lights rather than the legacy lights, but there are priorities at work here and the user community is pretty well defined.