No problems with balancing. They're an exact fit inside the lip of the rim, so no centering issues. 3 ways to go regarding filling:
1. Leave intact and remove covers for filling (not really recommended, just cuz it's a pain, and you have to re-threadlock every time!)
2. Drill 1/2" hole at valve and use longer stems or thread on the 1" extensions (available at all auto parts stores.) The tip sticks out.
3. (My favorite and what I do on my car.) Keep the stock short stems. Drill the 1/2" hole at the stem location, and cover with 1" round silver stickers (sheets available at walmart in the school supplies section.) To fill, peel off and toss the sticker. Pull the 1" stem extension out of your glove box (where I keep mine,) Stick the extension into the hole and thread it onto the short stem for filling. When filled, unthread the extension, and slap a new 1" round silver sticker over the hole (I also keep the sheet in my glove box.) Done! You can also use the aluminum tape (used for duct work. Cut 1" circles.) This works well too, and either way, you can hardly notice the small sticker over the hole!
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