Instructables

Step 8: Drill and tap the valve's hole

I decided to drill a hole in the top of the propane tank, so the entire thing looks streamlined. It took a while to drill through the top, and its harder to tap, but it's worth the better look. For this one, I just went straight in with the big drill.
When you're done, this hole will be hard as hell to tap. You'll need LOTS of wd40, i used half a can, and you'll need to do a reverse turn every 3 turns. I even managed to dull my tap on it. Oh well, gives me a good reason to return it, I guess.

Anyways, once you're done tapping, you should put some Teflon tape on, and screw in the valve. I had to grind the handle down a little, so it doesn't hit the tank on the way down.
 
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