"Easy" ? all depends on how good a job in glueing the seat and gimble on the builder did. You may be able to lock it in a vice (protected of course) heat it up and then hammer it out. Use a mandrel of some sort to use against the edges of the broken blank. Hard to describe. I just happened to have an old pheumatic jack handle that fir perfectly inside an ALPS seat I was trying to salvage and it hammered right off.