Hi,
Ptfe is much more chemically resistant than acetal “aka” Delrin, which can break down into formaldehyde. Ptfe machines easy as a bar of soap, also dents like one… be carefull!
It is also stringy and often wont break chips, be carefull of getting the long noodle chips from wrapping up everything, or catching you or other near by tools. Start the hole with the largest drill you can muster, then your gonna have to use a boring bar to open up the inside diameter. Also because the material is so soft forget chucking the part by any hollow section, you will crush it. Machine if from the end of the rod and part it off, probably wont be able to face the backside with out el’scrapo!
The key for this one is hitting the same tolerances on each one, try to keep the weights the same. Afterword you can balance them by removing small amounts of material from each one until they weigh the same within reason.
For tooling go with some razor sharp hss