Update: We found out that one of the previous owners removed the roller assemblies and replaced them with the Slide-Ezzz kit. We've ordered the kit and that should take care of our dilemma.
We're trying to sort out the problems with the sliding doors on our new to us Kha Shing Sedan 40 which are very heavy and hard to open. It appears that the rollers are either damaged or missing altogether and the carriers are not functioning properly and some are damaged and missing. The door is metal and may be wood cored. There aren't any manuals for these boats. Here are the photos if anyone has any ideas.
This drawing shows how I think the roller is set into the door.
