Snap-on wheel balancer antique--help

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IAM AN OLD RETIRED MECHANIC---JUST INHERITED A SNAP -ON WHEEL BALANCER---WBK--2B---SNAP-ON HAS NO PICS OR OPERATIONAL MANUELS FOR IT.THE 2-C MODEL REQUIRES REMOVING THE WHEEL FROM THE CAR. THIS MODEL IS DESIGNED TO MOUNT ON THE OUTER WHEEL RIM ---THEN YOU SPIN THE TIRE BY HAND. IT LOOKS SIMPLE BUT IAM CONFUSED AS TO HOW TO SET IT UP AND READ IT
A PHOTO----COPY OF INSTRUCTIONS WOULD BE MOST APPRECIATED----IT WAS MADE IN THE EARLY 50s IN KENOSHA WISC. BY SNAP-ON ITSELF
ALL MY COLLEAGUES ARE DEAD AND NO ONE IS TALKING OR WHISPERING IN MY EAR--------OLD [email protected]