We have some 1950's vintage American Standard toilets, and the consumable part in the fill valve is a cheap little rubber disc that wears out, fails to seal to the seat, and creates the "singing toilet" problem. It happened again yesterday so I went to the local old-school, been-there-since-the-1930s hardware store where I got one last time. They had the hook for them, alright, but none on the hook, and the owner said that yes, he needed to order some, one of these days. I then went to the national chain hardware store down the road and they laughed and said that the obvious solution was to take out the otherwise perfectly good brass fill valve and put in a new flimsy plastic Chinese one. Went on-line to Amazon and of course they had the OEM part at the nearby warehouse and delivered one to my front door for free the next day. What's going to happen next time I need some obscure bit of hardware, I'll look at Amazon first and not even bother getting in the truck and checking with the local guys. Which I hate to do, 'cause I like the local guys.