Yes, a 13/8" slug will fit inside the switchgrip sleeve! You don't need to get a 11/2" slug, not unless you want to take the sleeve out, but you don't have to! When somebody comes into my shop with a switchgrip and they don't want it or they bought it from somebody, I just put a 13/8" slug inside and drill their thumb size and they're good to go!!!!
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"Train a child up in the way he should go and when he is old he will "BOWL UP A STORM AND BE KING OF THEM ALL" and not turn from it."
Roto Grip - Storm : What else do you need?
Bruce Campbell
IBPSIA Certified Technician
www.rotogrip.comwww.rotogear.com