I made a lot of money on that!!!!! Even good players had a hard time. The bigger the pocket and a deeper the shelf, the easier the money! Old Gandy tables were perfect for the cash.A related proposition I've mentioned before that is in Willie Jopling's booklet is to pocket six balls in six shots. The proposer calls the order. It is much harder than it looks. Note the exact positions of the balls. You are not allowed to pocket two balls on one shot.
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I never tried it on a diamond. I haven’t even thought about it in 25 years.