That is my pet peeve. With any job, you put in random fasteners and I start cussing. Helping my father-in-law, I replaced a failed mini tankless water heater under his sink. Installed by a "pro." Of the four screws used to mount it, I needed three different tools to remove them. And I constantly find the same sh!t every time I follow someone else's work.btw i wished that was the only screwup the PO did... i think he robbed a hardware store full of random size bolts and then went over to advance auto to buy cheap s*** to make the V8 run....