I also had an 88 with the odometer shaft slipping off the pot metal gear
but fixed it with much less fuss. I was afraid of cutting, crimping and
gluing the pot metal gear to the shaft (glue might also stick the case or
first set of numbers) so I applied several very thin layers of rubber
cement in the center hole of the gear, let it dry well and after I had
lined up the numbers I forced the pot metal gear back on. Mine has been
working well for a year and a half or so.

Bill Hayeslip
88 GL
Pgh, Pa.