My own main arm is a JMW 10.5. I personally prefer to have the counterweight
as close to the pivot point as possible and have never experienced any tracking
difficulty with that approach. In situations like yours with lightweight carts, I've
simply affixed some small pieces of Mortite (plumber's putty) up under the
headshell where it's not noticeable, and smoothed them with a flat tool of some
kind. This also provides a bit of resonance damping, and it's easily removable if
you decide to try something else. If it doesn't offend you esthetically, it should
do the trick :-)
as close to the pivot point as possible and have never experienced any tracking
difficulty with that approach. In situations like yours with lightweight carts, I've
simply affixed some small pieces of Mortite (plumber's putty) up under the
headshell where it's not noticeable, and smoothed them with a flat tool of some
kind. This also provides a bit of resonance damping, and it's easily removable if
you decide to try something else. If it doesn't offend you esthetically, it should
do the trick :-)