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They are worn, I suppose, after the first round. :) But I assume you want to know when to replace them..... Many of them are a 'sandwitch' of hard, soft, & hard metal - or some such. They will wear through the hard surface, quickly wear the soft through, & wear on the 'back' hardened surface again. This will show up as a ripple or pocket or ridge generally in the lower front corner. If you are buying a plow, at this point I would say they are worn & have no value to the plow. If my plow gets to this point I start looking for a source for new parts.... However on my plow, I keep using them until one area gets paper thin; the bolts wear off & are ready to pull through; or it wears through & starts wearing on the frog/ other plow parts. Perhaps I don't change mine often enough. But, I tend to change the lay (bottom cutting piece) & shin (skiny vertical wedge piece) a lot more often, and keeping new & thick metal on these 2 areas helps keep less stress on the molboard even if it is thin. Basically, metal wears away, & they are 'worn out' when too much metal is gone & it don't work right any more. Some folks wait longer than others to replace, up to you. --->Paul
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