'My arm cuff and upper shaft (just below the arm hold) wobbled a bit so I put a bit of black electrical tape at the shoulder of the upper shaft and also the top and bottom where the arm cuff meets the top of the upper shaft. Problem solved.'
'That's where my slight wobble was coming from too. I took the armrest off and put a full wrap of electrical tape on the rod where the plastic casting makes contact. That fixed it...solid as a rock now.'
The wobble I had was minute. Initially I took the armcuff off, held the vey top of the detector against the back of my forearm with my other hand and wiggled it. I could feel a slight wobble coming from the upper shaftlock, that's where I put one turn of electrical tape next to the shoulder. Repeating the wiggling showed that the wobble was gone. I then put the armcufff back on and wiggled it. Again there was a tiny wobble, almost undetectable, putting one turn of tape top and bottom where the armcuff meets the shaft stopped the wobble and it's totally solid now.
The wobble I had was a minor issue when you compare it to the performance of this great machine!