A Bowling ball can classify as an X-Out for any of the following reasons:
Normally, a X-Out will have all of the same reaction characteristics as a "1st Quality" ball but has been labeled as an X-Out for the above listed "technical defects". Any decent Pro shop should be able to drill "most" X-Outs for you and achieve very close results to a "1st Quality" ball.
The major problem comes with any X-Out that is extremely off compared to a "1st Quality" ball. This can cause problems for the driller to be able to achieve the desired reaction without using a radical layout or removing extra weight that might make the ball illegal to use in competition.
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