Sure, you could make that work, why not? On a basic x-y jig, it's basically just a table that moves left/right and back/forth.
Just find something that can hold and secure the ball. Figure out how to zero it out with a bit, and then go for it. The only problem I could see would be if the measurements are off. Since that jig is designed for flat pieces and a bowling ball is a sphere, I don't know if moving 1/4" would equate to the same.
Really how is that jig any different than these?:
http://www.ebowland.com.au/vacujig.jpghttp://www.innovativebowling.com/images/mill_drill_powervac_jig_new_digitals1.jpgFigure out how to clamp the ball down and give it a shot. If you have the tools and can find some material, it shouldn't be too hard to make something like this:
http://www.bowlingindex.com/store/merchant.mvc?Screen=PROD&Store_Code=BI&Category_Code=PST&Product_Code=PS-SJig--------------------
Haywood
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"Let every nation know, whether it wishes us well or ill,
that we shall pay any price, bear any burden,
meet any hardship, support any friend, oppose any foe,
in order to assure the survival and the success of liberty."
--JOHN F. KENNEDY
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