Triton definitely don't make an 8mm collet. I've been trying to get one myself, not only for the bigger machine, but also for the new 1400W MOF001, which uses a different style of collet from the big boy (Hitachi-style).
According to a contributor on another forum, the new-style (self-releasing) collet from the 1400W can be fitted to the bigger machine, but I'd assume that you have to fit the whole assembly. The advice I got for doing that was to remove the brushes, invert the router, spin the motor clockwise using an airline to drive the cooling fan, then - once it was spinning, push in the spindle lock to unseat the collet chuck assembly.
This all sounds a bit "iffy" to me. although I would like to fit the self-release collet instead of the Hitachi-style to the bigger router, as they definitely grip inserts better.
Any engineers out there who could comment on the method of removing the assembly as described above?
Ray.