Replacing a bike seat is a simple task. A bike seat should be replaced when the outside covering is worn and the metal seat is exposed. An old bike seat looks like the one in the photograph. The material is ripping and the metal seat is exposed. 

New bike seats can be found at any [...]

 Many parts of an antique tractor are not manufactured any longer, and purchasing used parts are not any better shape than the one that needs repaired. In many instances the local machine shop may be the best choice. I am not an antique tractor guru by any imagination, although cleaning up a bore and building [...]