When I setup the tee in the vise I made sure it was at right angles to the pipe that is used as the "arm". I used a 3/4 inch drill bit which barely took out the top of the threads as it passed through. I figured that the drill bit would probably cut the hole a few thousands big and it did, which made the tubing an easy slip fit. A few drops of oil and it's as smooth as silk. Also having traces of the threads left makes a nice place for the oil to collect and keeps it lubricated.
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