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Here's the rod holder chuck that I use.

http://i257.photobucket.com/albums/hh238/herefishy2001/DSCN0182_zps1e78d444.jpg

Don't know if this would be what you want, but I bought a motor with an attachment to hold my rod while turning - it was a pvc cap, 2", with a hole drilled in the top - this accepted a screw which...