i use a tap and die on a standard hole with no threads, it works amazing.
https://www.amazon.com/Clocks-Watches-Tapping-Metric-Straight/dp/B078KHKTVG/ref=pd_cp_469_1?pd_rd_w=SNa5G&pf_rd_p=ef4dc990-a9ca-4945-ae0b-f8d549198ed6&pf_rd_r=ZVSSQ6K27G4GSXHF6YTH&pd_rd_r=de5bce19-8953-11e9-aa11-b9b22186d32d&pd_rd_...
https://www.amazon.com/Clocks-Watches-Tapping-Metric-Straight/dp/B078KHKTVG/
you just need an M2 tap