Step 2Modify the threaded cap
First, I used a paperclip heated over a lighter to make a dimple in the center of the cap. Then drill an 1/8" hole using the dimple to keep the drill bit from skipping and sliding.
After the 1/8" hole's been drilled, change out your drill bit and use a 1/4" bit to make the hole the final size.
(Note: I didn't do this on the first cap, and the hole ended up off center. Luckily, knowing my personal handicap when it comes to doing things right the first time I bought spares.)
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