I made a set from 1" Delrin rod from Amazon for $13. It's actually enough to make several sets.
https://www.amazon.com/dp/B08M..._asin_title&th=1
First photo shows rounding the edge on a belt sander. Second photo shows using the chop saw with a C clamp stop to ensure correct length. Fourth photo shows checking for correct fit. You can easily cut them a little bit long and then belt sand them to fit.