It helps if the actors can all dress up in something which suggests a bowling pin. The original production had them all dressed in white (gloves, caps, and sneakers, too), with red scarfs or sweatbands around their necks. Feel free to have fun with it.
Sound effects of a bowling alley might also be helpful if you have them, but aren't necessary. Good actors always work wonders.
Cast of Characters
a bowling pin, a bit too tightly wound
a bowling pin, a bit more laid back about things
MIDDLE PIN (Sparky)
a bowling pin, has been hit and knocked down a little too often, frequently off in their own little world