Yeah, but only use the 10k on small diameter bits (1/8 and smaller like 1/16), and, you will have to adjust the end float as well (sherline recommend this) to avoid heat build up in the bearing. You will loose about 3/4 of the torque you have right now. The current setup will probably handle a 1.5 inch throw flycutter, continuously for hours on end. I have no experience with running them fast. Unless you really need very small bits regularly and high feeds, I would actually stick with this set up, it has a long history of being very good and reliable. Unlike cheaper stuff, Sherline do seem to know what they are doing and how the machines perform so if they say adjust endfloat, best to do it. For occasional use of small bits, just take it easy? Just carefully cleaned the scroll of my Sherline 3 jaw chuck and bit down on some accurate ground bar, the run out is less than 0.0005" (0.012mm or resolution of my dial gauge). It's about 15 years old!

Tom