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You could think of it this way; if he hadn't paid you, then he would owe you a favour and that would put him in the awkward position... and you don't want that, do you?
Ratbastid is right (as usual), if you hadn't done the work they would've had to hire a quantity surveyor, and they wouldn't get one of those for $42 - especially not on emergency call-out rates.
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