I've got a AO Optical Ultramatic phoropter. The Auxiliary Lens Knob (OD) is loose. I looked at the phoropter and couldn't really see anything that would tighten it. I looked at the manual online and no luck. I'm thinking that I might have to get it serviced. Anyone had a similar issue at all. This is the first problem I've had with my phoropter in almost 40 years.
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