I needed to replace my badly damaged mast head pulley, but could not find a suitable candidate. So, I sketched one (attached). If anyone is interested in a lathe/milling machine project, this would be fun. However, I found a pulley and bearing on McMaster.com that I installed on my mast. Diameter 3-1/2" Pulley: 9466T64 ($7.75) Diameter 5/16" Bronze Bearing: 6391K405 ($1.25) Press the bronze bearing inside the bearing that is molded into the pulley.