"Lowest bidder" - The whole job has to be ripped out and redone. He used heaps of second hand crap too. It's a real mess. You should see his companies electrical work. They don't have a mechanical services or electrical license. It's a wonderful situation.
High pressure seems to mean different things in different situations. eg:water jet vs UHP water blasting vs tapered coupling installation vs um, tyre inflation?
It may literally be hanging on by a thread
Wait, the common phrase does come from a fiber thread though right? O.O
Yes, but it is applicable here.