"Grrrrrrrrrrr skip grrrrrrrrrr
"Grrrrrrrrrrr skip grrrrrrrrrr skip grrrrrrrrrrr skip! And if the skip lasts too long, you're in trouble.
I'd suggest that if the starter motor reaches an area where it won't bite (will not turn the engine), then remove the starter motor while in this position and examine the "ring" gear on the flywheel.... it will be right there visible when the starter motor is out of your way.
You should also be able to turn the engine over by hand as well.
This will index the flywheel and bring any bad ring gear teeth around and visible.
A ring gear is an inexpensive part, and very easy to install onto the flywheel.... It's getting to the flywheel that is the PITA.
(Great time to inspect your drive coupler/hub as well!)
Be sure to get a quote for a repair after a full diagnosis......... and a diagnosis that says "This IS the Problem and This Will Fix It!"
There is no sense in letting them spend your money if this is NOT the issue."