I use vinyl faucet washers I found at Home Depot by the leaky faucet repair kits. The washers are big enough and snug enough fitting that they can support the weight of the stone on the rod with the attached Digital Angle Gauge. I also use the same washers above the stones to limit the amount of slide so I don’t lift the stone above the knife edge causing damage if I come back down flat onto of the bevel.
There is a ton of good stuff out there to employ as mods just walk the aisles at the big box hardware stores and use your ingenuity.
Recently I purchased these Plastic 1/4″ Shaft Collars from Zoro.com. They work very well and would probably work for many situations. They were a little too snug so I did have to back off the set screw and gently drilled/reamed the bore slightly larger. Using them does require me to keep an allen wrench handy for the set screw.
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