i made a teflon bag rider up last week and shot my best score ever with it on the weekend.
could be a good thing?

14mm / 8mm PTFE teflon tube.
The teflon is 90% teflon and 10% of another polymer to improve wear resistance and reduce flex.
The stainless rod inside is 8.15mm 3D printer rod with associated drive motor adapter i use to lock it up at the rear. The extra weight on the rear has been beneficial and welcomed.
The front end has a 3D printer Precision bearing. and the lot has been trued with a laser line/level.
Total cost was $41 including postage of all components. The teflon tube from Germany was the most expensive part.
Total time, about an hour to make and align and a couple of weeks for all the components to arrive.
its amazingly slick on cordura ears. and i think well worth the effort.