Don't budge you did the work and now you need to get paid. Do as sudjested above and put a lein against the car. You can probably get $4313 for a clean Alfa. If you can't drag him to court.

Business is business it doesn't matter if the son shot himself it isn't your problem.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200