What's the name of the instrument Chiropractors use, mine used once on me, it's a spring-loaded, trigger with a rubber tip. It's held by the index and middle fingers with thumb on top. It's placed so it has contact with the body on the skin over a muscle, is about 8" long. When he pushed down with his thumb it' released a spring that quickly "injected" instantly about 10-20 lbs of pressure to relieve a knot in a muscle. It felt wonderful.
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