Yeah, I don't see any logic in asking him for money 3 years later.... if roles were reversed and he was knocking on your door for money, would you pay it?
I mean, it would be kind of shitty if he knew 3 years ago, saw your yard dug up working on it, and thought... oh nice, free work! But, it's possible he doesn't even know and he had no say in what you did 3 years ago (maybe he would have just opted for his own line then or knew a guy who could do it for less, etc.).
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