I've held my inhauler rings up with some thin shock cord tied around the outer-part of the ring with 3mm dyneema whipping, and then up to the innermost shroud just above a few wraps of riggers tape around the rod. Occasionally the ring gets pulled into the stainless handrail, but never hits much of anything else.
After some trial-and-error, I've found that attaching the shock cord fairly high up the shroud (18"? 24"?) is the key to keep the cord length tension somewhat constant through the ring's athwartship range of motion. Too low and the ring sags when outhaul is off and consequently the shock cord is over-extended when the rings are fully inhauled.
I can send photos and measurement of my setup, if that'd be helpful.
Note that I have a North "high wind" #1 jib, whereas a lot of east coast boats have the lower wind version. The higher range #1 doesn't lend itself to as aggressive inhauling -- I rarely can, or want, to go more than a few inches inboard of the rail.
I found that a few wraps of riggers tape and then a bit of light whipping over the top, provides a good enough stop for the shock cord that you can then just tie a two round turns and two half hitches in the cord just above it and you're done. Two full turns reduces the stretch around the rod and the chances of it pulling over the riggers tape.
On the bottom end I tried a bowline, but wound up tying some whipping on the tail out of paranoia.
Shock cord knots are often wobbly. I've since learned about perfection loop (angler's loop) knots, overhand loop knots, and the zepplin loops, which, in theory, are supposed to be good for this sort of thing. When this cord eventually wears out I'll try something neater-looking.
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