The other day I noticed that a plastic cap on one end of the sliding
door arm had shattered.
According to ETKA, it looks like part #251843390A, called "protective cap".
My main question is, What is it protecting?  Until I can get a new part,
I've been using the door without this cap in place, but I'm a little
worried that I may be damaging some other precious NLA parts by doing so.
And a related question:  Has anyone tried replacing this with some other
kind of generic plastic cap available at a hardware store?  I didn't get
a good sense of what the cap looked like before it fell apart, but it
seems pretty vanilla to me.
-Thanks