I just used a piece of 1/4” ID
fuel line hose, cut to length and split along its length. This allows it to wrap around your lifeline, then just tuck it into the stanchion. Costs Pennie’s and easily replaced if
lost. If they seem to slip out of the stanchion just coat it with a dab of caulk and it will stay in place.
Fuel line hose OD’s for 1/4” ID’s vary so you may have to try a couple brands to find the perfect fit.