I spoke with the new owner of Wheaton at HE2004 and while I was trying to compliment his product I,at the same time told him of my concerns about the play in the vta scale as well as the fact that dialing in an EXACT tracking force required a "HUNT AND SEARCH" approach (with the non-exacting)way of sliding the counterweight as opposed to the EXACT threaded rotation of the GRAHAM.Tiny increments in downforce make all the diff. in a high res set up.His response to me was that he felt his counterweight system was good enough.Sirspeedy,
I recently contacted him with exactly the same concern (lack of fine control of VTF). I even offered an easily-implemented fix/upgrade that would provide the needed control. I got a similar response, polite but noncommital. :-(
OTOH it's not at all difficult to devise your own fine VTF control. We set our C/W for the top end of the likely range for the cartridge. If we want to reduce VTF then one or more O-rings slipped over the end stub reduce downforce by .01-.02g each. Pretty simple and very quick.
When someone makes the perfect arm I guess we'll all buy one. Until then we each have to choose our favorite set of compromises. If the Schroeder Ref had tool-less VTA adjustability with a scale for repeatability, there'd be one mounted on my table today.