Don,
The OD is standard, except for the MS sizes and VERY large size.
Yes, you, if you/they are careful, can use the other end of the grip, I'll sometimes use to non- P/O end for a spare ball, when a customer wants non P/O and wants to save a few bucks. Keep in mind, you have to clean off the insert and be careful taking it out, but you can "re-use" them.
The size chart is for their inserts, to me it's easier to have the number than the size on a customer's sheet, saves space, I'm old and lazy.
Hope this helped, and keep in mind, not everyone 're-uses" the insert, I may be alone in that area, just what I do, as long as the customer wants it.
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AZ Guy aka: R & L Bowlers Pro
rlbowlerspro@cox.net
www.rlbowlerspro.comSleep is over rated.