When using K & S 83060
I cut a short piece of rubber hose with an ID just larger than 3/16.
Chuck the hose in a drill with the K&S in the rubber hose, not too tight.
Take the tap and hold it with your stationary chuck.
I just use a little motor oil.
A quick countersink to start before tapping.
Each threading to 1/2", usually 2 passes maybe 3, takes less then 1 minute. Edit: With the 2 flute tap
While you have the tube in the rubberized chuck give it a spin with polish, no scratches or marks from the chuck.
Chuck
Never typed my name so many time in one paragraph
