I want to be able to use 1/8 cnc bits in my Ridgid R2200 router, as I can get more detail in my cuts and corner cuts will have a smaller radius than using a 1/4 bit. I have seen some are buying a second Ridgid collet nuts (~$20) and the size ER16 1/8" collets (~$15). My concern is the ER16 collets were not designed to be used with the Ridgit router and may come loose or maybe off center causing a wobble that can be very dangerous.
As an alternative I just purchased a 1/4" to 1/8" Collet Adapter that is simply a sheeve that fits in the 1/4" collet that comes with the Ridgid R2200 router at only a price of ~$7 for 2 collet adapters:
I would love to hear from people that have successfully made the smaller bit conversion on the Ridgid R2200 router and their experiences.