2 hotend mount

I found it hard to clip my hotend into dob71's 2 Extruder Mod. I modified the hotend mount so it is in two pieces which will hopefully make it easier to install
the 2 extruder mount V2 - includes a recess for a M3 nut
the 2 extruder mount V3 - includes a recess for a M3 nut and is symmetrical
the 2 extruder mount V4 - the gap between the hotends is larger to fit the hotends I bought which may cause it to not fit in the http://www.thingiverse.com/thing:9869 X Carriage as intended includes