Step 3Make a Filler Valve Fitting
Tire stems are a press (or pull :P) fit. So make the hole as small as you possibly can. .5" caps are a tight fit, but it fits nontheless.
When you think you're ready -- push the stem through the back of the cap. Then pull it through as hard as you can. Pull one way and then another direction until you notice an edge pop out and set itself on the outside of the cap.
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