djradz
You are right about the ~2" tab that acts like a hinge when laying over (turning) the plowed land into the furrow. If this isn't there, the plow will lift the dirt and just slide it over, sometimes not getting a good 180 degree flop, which is what makes for good plowing. You want the green side to be down, and the trash to be at the bottom of the furrow. Good plow adjustment will take care of this.
Soundguy
One doesn't keep greasing the plow share while plowing. That would maybe be a lot of grease. Only time the plow share needs to be greased is when you stop plowing, and put it away for a spell. The amount of grease in the soil is less than a tiny, tiny spit in the ocean (ahh yess, but it is still a 'spit').
My son couldn't get a final inspection to move into his house because the garage floor wasn't poured yet (the ground was frozen because of delays in sub-contractors coming on time). The reason given by the inspector for the 6 month delay (extend the construction loan, possibly miss the better interest rates, etc.) was that the car might drip oil on the gravel base, and contaminate the water supply. Get real. What if the car drips oil when it is sitting outside the garage?
Go figure. /forums/images/graemlins/grin.gif