farmall m magneto

i have a farmall m with a magneto start. as i was taking off the rotor to replace it the plastic piece with the notch
that the rotor slips on came off the magneto shaft what if anything can i do to fix it . im sure super glue would not
hold and how hard is it to get the plastic back in the right place
 
If the gear came out with the rotor the cover plate with the two screws must be missing?

I should have two of the cover plates if you need one.

To time the gears you have to clean all the grease off first. The small steel gear will have one tooth with the corner filed off. The large gear on the top edge near the rotor notch will have two letters an "R" and a "L". If your M is a gas burner line up the mark on the small steel gear with the letter "R" on the large gear. If you have a diesel use the letter "L"
 
After I read this again. The plastic piece came off the brass gear?

If this is the problem. You need to buy a new rotor drive gear. They are available on ebay and some after market parts suppliers.
 

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