Difference between JMW 12.5 and JMW 12.6 tonearm

Got it the first time. Does anyone know any real differences between these two arms?

I have spoken with Harry before. He is great to deal with and is a wealth of information. Their hours that they take calls are limited and I just thought that someone on Audiogon would know the difference between the 2 arms.

I just bought a VPI Aries 2 Extended with a JMW 12.5 arm. It has the Nordost Valhalla wiring. I think you can get the Valhalla wiring on any of the JMW arms.