Incidentally a sling shot is a great way to transition do to cross-dominance...
Have you tried extracting the agitator balks from rattle cans? You get a free glass/plastic sling ball and can make use of the residual paint in the can..
-OMotS
"If memory serves fails me..." Quote: ( unnamed) "been prtty deep in the cooler todaay "
Television and radio are most effective when people question little and think even less.