most likely the starter bendix gear, it is a ball ramp type gear and when it skips they give off a screch kind of sound and they do not turn the engine over
When you are fiddling around in that solenoid/starter gear linkage area, the first thing is to disconnect the battery. I disconnect the positive battery cable at the battery.
Thanks for all the input guys! I removed the primary cover, put the bendix gear back in place, (it popped out), replaced primary cover and back on the road!!