Just when I thought I heard it all. You're saying that a material softer then your tip, specifically choosen so it can be applied to your tip, shapes you're tip as you apply it...?
If that's the case then I can now understand why some people think drilling into their chalk is a better method than swiping it on. That said, that would mean that the tips on my cues should have a 'X' pattern worn into them.
Maybe the next time I get a tip change I'll tell my mechanic not to bother shaping it for me. Instead I'll drill it into the dirt in my front yard and see how long it takes to reach a dime shaped finish.
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Interesting theory...