Maston rc marine sells them for a very reasonable price, good company too.
Cupping ball set
Tool for adding cup to props
Manufacturer part number: MRCM-CB
Manufacturer: MRCM
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$50.00
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Our own cupping tool . Set of 6 different size balls on an aluminum plate . Put in the vise or set it on the work bench . Select the ball size for your prop . Thread it into the pedistal . Position prop over the ball and lightly tap the cup that you want into the props edge .