I seem to recall someone posting about knobs elsewhere on the forums and obtaining them from Radio Shack, but I can't find the post.
Nevertheless, the the CSP+ and Taboo III posts are 1/4" diameter and they have no flat side to better hold a set screw.
Parts-Express has black & silver aluminium knobs for 1/4" posts but the overall diameter for most is 0.77" which might be too wide:
http://www.parts-express.com/pe/showdetl.cfm?partnumber=240-211and there is silver one with a diameter of 0.58"
http://www.parts-express.com/pe/showdetl.cfm?partnumber=240-210 Has anyone put knobs on either piece and if so, what was the diameter of the knob(s) used? Did the set screw hold the knob tight for turning?
Thanks for any advice.