If you're of the spinning persuasion, the Fuji CAM lock is a great product to allow the user to locate the reel anywhere along the handle.
It's the updated version of the simple ring.
I have a custom spinning rig w/CAM locks that is built on an original USA Fenwick HMG 9' - 8 wt.
Sweet stick that bends to your hand and can protect 6# test.
(graphite tubular handle)

For baitcasters (me) it's a custom build or shear luck with a factory.

Scroll to CAM lock:
http://www.fujitackle.com.au/fujireel.htm
_________________________
NO STEP ON SNEK