same problem
Mine are old (1981) and starting to crack and break. I'm considering my options, on the bottom of my option list is replacement of the the posts. My wife said it would be cheaper and easier to simply have new tops made at a local machine shop that slid over the current post. She than said that a pair of set screws would hold it to the original post. I thought it was a very good idea, even for a girlie. Has anyone else done something similar or am I going do the road of crappy engineering inc.