For those that love CBT this is a simple and very effective device. Just simply turn the screw mechanism, counter clockwise, to make the bar move inward, applying deep pressure against the balls. When you‘re ready to release them just reverse the direction of the screw.
This device is also great for use as a parachute for hanging weights or tying the balls off to another object.
8,9cm high and 8,1cm wide.
an inner opening 7,4 cm * 6,6cm.
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Vana-Narva mnt. 22