This 5C chuck uses an available Grizzly backplate. No turning required:
http://www.grizzly.com/products/G0602/parts/75C COLLET CHUCK:
ORIGINALLY POSTED BY Hans_G;661002: "]The Yahoo Grizzly 10x22 group had a few people who bought the CDCO 5C collet chuck and a spare 3 jaw chuck backing plate from grizzly (p/n P0602054-2, P0602054 is the 3 jaw chuck itself). The holes in the plate line up with the chuck."
They used to cost about $25, but now they are $70. Quite an increase in price.
CR.