You won't really know untill you get it off and remove the rear cover. Some are soldered and some have a machine screw and nut. If soldered you will need professional carbon
arc soldering
equipment. Either way if you can find a local shop to do a quick fix and look for any other
parts that are worn. You should have a minor
repair. This would be a good time to replace the solenoid and drive
gear and check the front and rear bushings and the
brushes and brush springs.
Remember when you re-install the unit that you only tighten the
battery cable nut on the solenoid to 1/2 turn before it breaks! Some fellas will tighten it till it breaks and then loosen it 1/4 turn...this is tooo tight and will cost you another solenoid. :-)
Just some shop
humor.