I use the anti-skate device with one rubber ring as I decided not to twist the Valhalla wire. I hear the difference when it is not adjusted properly. The third post answers your question on disabling AS when using the wire twist method.
01-11-13: Stringreen
I presumed those with inadequate knowledge of VPI arm setup procedures (that the rear counterweight is easily moved around its center without damage, and that the internal counterweight is easily adjusted via the Allen wrench inserted into the back of the arm) would appreciate the knowledge herein provided.
Stringreen: I believe you have inadequate knowledge of the differences between JMW-9 series of arms. The JMW-9 (JMW-9t?) does NOT have the set screw in the rear of the armtube. I suspect it was released this way to meet a price point.
I started with a Scout TT having the JMW-9 tonearm. I found it to be virtually impossible to optimize both VTF and azimuth as the counter weight is used for both. If the drill press wasn't buried in the garage, I would have drilled and tapped a screw into the counter weight for fine VTF adjustment. At that time, the CounterIntitive was not available.
When I found out from Mike that the JMW-9 Signature armtube has a set screw at the rear, I swapped tonearms without hesitation. After the JMW-9 experience, I will never again own a tonearm that does not have discrete adjustments of all parameters.
If I still had a JMW-9 tonearm, I would either have tapped a screw on the rear somewhere or be using the CounterIntitive to make adjusting the azimuth and VTF easier. With the JMW-9 Signature, I do not require the CounterIntitive product as it has independent control of all setting. With a very light touch, I am able to adjust azimuth with changing VTF.