Halp! Dis- and Re-assembling drum taps

[Invalid Stout]

I feel pretty dumb at the moment. I disassembled a drum tap by prising the cap off and unscrewing the knob so I could give it a good clean. Now I can't figure out how to put it back together.

[softlad]

The twisting part of the tap will screw back in two positions, One position means that when you put the top back in place, the tap wont close.

Re-fit the tap, starting at a position 180 degrees from the wrong position and it will work. Add a spear of vaseline to the thread and the tap will operate a lot smoother.