The plastic on the hinges is a common fail point where the tension spring finally breaks through. There's a fix around here somewhere where holes are drilled in the plastic and a brad/fine finish nail is passed through creating a new support for the tail of the spring. There are also several different, all-metal hinges that from different manufacturers that will fit. I know some model of JVC TTs fit because that's what I'm using on my own. Linn also fit, but they're kinda expensive. Check the auction sites for TT hinges, and look for the correct shape. The only thing needed to be a perfect fit is a couple of felt shims.