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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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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