I can understand the accuracy based on the balls I had drilled. The grease pencil leaves a fairly wide mark opposed to a fine scribe line and if the pencil is not real sharp it leaves an even wider line. So when setting the drill on the line or X it could be off by a thousands of an inch or more, atleast this is how I read into the accuracy between the two methods?
In regards to the line damaging the ball, I don't think the scribe is even near the track so I would not think it is an issue? Cosmetic, I agree.
Interesting thread as I never heard of the scribing method. But I wonder why my Dads Brunswick Black Beauty from the mid 60's, and in brand new condition BTW, has no scribe lines because there were no grease pencils back in those days, wonder what was used back then?
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