I once modified an eyepiece with an occulting bar. It's a piece of wire threaded across the diameter of the eyepiece at the focal point. I tried it on a rather large telescope (24 in?) in Sonoma county under a dark moonless night while Mars was at opposition. The occulting bar was used to block Mars so perhaps the moons would be visible.
I couldn't see them. But others in our group claimed they could. I asked them to sketch what they saw. Later, I looked up where the moons should have been at that time. It matched their observations.