Jim: Thanks to both you and BobM. Yes, I do understand positive caster as it pertains to an automobile front spindle with an upper and lower ball joint - lower ball joint forward of the upper. Also, I understand positive caster as it pertains to a "chopper". In both those cases I can see where the pivot axis is ahead of the tire patch vertical.
The shopping cart example is more difficult for me to comprehend, but I think I have it. Now, the tractor wedge I am wrestling with. It seems to me that tractor wedge, properly installed, in effect, changes the angle of the steering source to where the pivot axis would be ahead of the tire vertical axis, i.e., positive caster. But yet, the shopping cart example would be like installing the tractor wedge backwards??? So, I guess I'm going to have to work my already over-taxed brain with it some more. Regardless, I'm going to go with what you and BobM have told me. Thanks. mike
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