An arsenal is a collection of equipment used for dealing with different sport oil patterns but I guess you could technically have different equipment for different lane conditions (wood, synthetic, etc) and carry down as the night progresses and consider it the same (just at a lesser technical level).
A spare ball is obvious (always bring it) but really, the more I bowl on THS patterns I tend to just play whatever ball seems to be carrying the most for me at the time. I suspect the psychological comfort it brings might bring me more relaxed and consistent bowling than any better piece of equipment ever could.
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