it probably *should* be done at lower tire pressures, not sure where it becomes critical. you can goop some sticky chemical stuff on the bead too, which makes it tough to get the tire off again, too...
When you are running tubes or are starting to cut decent 60 ft times (say, < 1.70) without tubes then screws should be considered. The rim can actually spin inside the tire. If you have tubes the stem is screwed to the rim and rips out if the rim spins inside the tire - instant right or left turn on the launch as the tire goes flat!
You can install screws with the tires mounted if you are careful. Do both sides.
I always balance my slicks. A small imbalance @ 100+ mph becomes significant. Use stick on weights on the inside of the rim and some duct tape over the weights to help hold them in place.
Do the back side screws first. While you are learning and make mistakes the mistakes will be hidden. Trick is to drill the hole the correct distance and correct angle away from the edge of the rim so that the screw head doesn't hit the rim.
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