In my industry I would deliver stuff, holding last bit in evaluation mode or in watermark mode due upon full payment. That's of course prevention measure. If y

In my industry I would deliver stuff, holding last bit in evaluation mode or in watermark mode due upon full payment. That's of course prevention measure. If you already gave up whole piece of work for them to ran away with - then you're in chasing mode. Forgetful clients next time will get preferential treatment - 100% advance payment requirement.