Shelter 90X Tracking Force

My 2 cents. The Shelter's VTF requirment, like most cartridges, is temperature dependent. My 90X is mounted in an OL Illustrious arm and for ambient temps in the range of 68-70f I track at 1.99g. Higher temps require less tracking force. I use a trick I gleaned from Doug Deacon and use different weight o-rings slipped on the arm stubb behind the counter weight. The temerature lets me know which o-ring to use and I can repeatably fine tune the tracking force with out having to move the counterweight and measure the VTF.

I have a rather large digital top-loader that I made a $0.50 "tool" to work with it. I got the idea from looking at the Wally Tool version. It's just a strip of plastic (retrived from the waste at local hardware store's window glazing station) that lies across the pan of the scale. One end hangs over the edge on which there is an adjustible skrew (the $0.50) with a smaller piece of plastic stip on the end of the skrew. The device is secured to the scale by placing a quarter on the end opposite the skrew and adjusting the skrew so the smaller strip is at record level. Tare the weight of the gizmo and place stylas on small strip to measure VTF. This is definately one case where a picture is worth a thousand words. I won't mention why I happen to own a digital top-loader :-)