Hunter 9700 nac

[Frederick Smith]

I don't know about the 9700 but it sounds like the Hunter "on the car"
wheel balancers I used years ago. Basically it was a large hubcap type 
device that was installed on the wheel via an assortment of adapters.

After it was installed, a seperate motor, kind of like a one wheel 
dyno roller, was placed under the wheel and actually spun up to highway 
speed. The center of the wheel mounted device had two small wheels that 
controlled weights in the rim of the "hubcap". By moving these wheels,as 
the tire/rim was spinning,(OSHA would have loved this thing) you could place 
the weights until the vibration was eliminated. You then stopped the motor 
and put the weights where the arrows were pointing along the rims edge. 

If you put a glass of water on the hood of the car you could watch the 
water surface dance and fine tune the placement of the weights. For the 
rear wheels you didn't need the "dyno". Just start the car (with the rear
on jack stands or a lift) and put it in gear. Watch the speedo and tune
the adjustable weight device. It was a very effective system but a bit
tedious to use. 

We would use it to "find" worn front end components, when customers 
complained of a shake or shimmy. By mounting the hubcap deal, and tuning 
the weights 'till the wheel was slightly out of balance, you could watch 
the bad ball-joint, control arm bushins, idler arm or draglink etc. bounce 
and shake, sort of simulating road movement. A pretty good diagnostic device.