it was lurker's typo which suggested that the slip was being rolled around on them.
I looked at making a steady myself, and inline skate wheels look to be the thing to use. I dont think that they will be heavily loaded, and if the bearings need replacing in time it doesn't look like a difficult task to do.
I rescued 2 sets of roller blade wheels many years ago and they've been lying in my Will-be -useful-one-day box ever since. I found a use for one so there are 15 left in 2 designs:-
They are 2.5"dia and 1" wide. They can be held in a chuck if required for clean up or modification. I modified the one that I have used to put a V groove in so that it now acts as a cable pulley. Any takers?
A huge thank you to Brian, (Yojevol) for the wheels which arrived today. It's people like Brian that make this forum what it is.
Hope I can return the favour sometime, or else show the same generosity to another member