Yep, I have it on my Prime and consider it a must have for ease of set up.
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The original (thumb screw) counterweight on the VPI 3D arm is not a user friendly design. The Counter Intuitive really makes life easier here.
From just looking at the newer Fat Boy arms, I see the counterweight has been improved upon. Looks like it's more a pressure fit design on a smooth arm surface. Much nicer!
I have a Prime, with the dual pivot and the counterintuitive. Like the person mentioned above, the counterintuitive weight fits very tightly on my standard VPI counterweight (180g? - I’m not near the table right now). I took great pains to make sure that the scale was applied as flatly and evenly as I could, but sliding the weight fore-aft or rotating it is very difficult. I’m not talking snug - I’m talking so hard that it’s difficult to keep the counterweight from moving. Suggestions greatly appreciated!
The Counter Intuitive is a slight fix for VPI's dumb move to dropped counter weights on all the arms, after to original round ones on the first version of the JMW arm.
The first VPI arms had a better (independent of VTF, and more fine adjustment) azimuth ring that worked great.
The latest VPI arms (fat boy) have gone back, to round counterweights and separate azimuth adjustment.