Originally Posted by
folderfan550
I recall someone using a plastic Presta valve cap as a stopgap replacement oil cap. Just screw it in tapered end first. Works fine on one I have and stays put as opposed to tape.
That's a good idea. FWIW, I've cut a stopper out of a rubber pencil eraser, and wedged it on so that one corner of the stopper is held down by a spoke. Not elegant, but it doesn't fall out.