I just spent $50 getting a chipped pulley welded. It's a double pulley that goes on a 1" shaft. Nothing that couldn't be jury-rigged, but it is the original drive pulley on my Waterloo 40. I could not buy an OEM replacement if I wanted. They just never come up. Once they are separated from the machine, they are just a double pulley.
That got me thinking: When is enough, too much? I mean, I'm $650 into repairing a $300 tractor, but each repair has been "cheap". There has just been a ton of them.
What factors do you consider when deciding to scrap or repair?