I am struggling to find a replacement bottom hinge for a side hung aluminium window. The windows are quite old (80's probably) but in excellent condition apart from this one hinge. The hinge is made by Shaw and has 305S imprinted on it which refers to the length, 305mm. Can anybody point me in the right direction? I have taken a photo of a good hinge on another window and uploaded it. //media.diynot.com/226000_225973_88385_59854125_thumb.jpg