1) Put oil on tap
2) Stick tap in hole
3) Turn tap gently. If tap starts to bind unthread 1/4 turn and then continue to thread forward.
4) Continue to thread until cutters on tap are seated then remove tap from hole.
Here you go. It's really very easy to tap threads into something. Make sure you measure the inside diameter of the pipe and verify that it's the correct size for the tap. Which is 23/32 for 1/2 in npt.
So i measured the inside of the fitting thats welded onto my keg. I measured the inside diameter and it looks like its 7/8", is that right? The opening has a lip and i measured the width of the actual opening.
also the guy that sold me the keggles gave me clamps for them and they say kf25 on them. does that help?
7/8 is closer to the OD of 1/2 inch pipe. Perhaps you have 3/4 pipe welded onto your keg. If the wall thickness is enough you may be able to tap it to 3/4 instead. You'll have to measure OD of 3/4 pipe thread and see if it is small enough to thread in.