John, that's what I remember about the T bar diameter. It's hooked to the spool valve and when you turn the wheel, if there is low resistance, the bar doesn't twist and doesn't open the valve, so no power assist. As the T bar twists more the valve opens more and you get more assist. The bigger the diameter of the T bar, the more effort you supply.
Now can someone tell me how to check the "WS6" box that I bought many years ago to make sure it is the right one?
