[Vwdiesel] trip odometer

[Doug]

I have the 81 Caddy instrument cluster out and found that the glue on 
the odometer drive gear had turned to powder and the gear was spinning 
freely on the shaft.
My trip odometer hasn't worked for a long time. The gear between the 
odometer and the trip odometer seems OK but there seems to be a little 
side-to-side play in the gears of the trip odometer. The trip odometer 
seems to engage better when the gears are pushed to the side where the 
drive gear is from the odometer. Is there a way to put a shim in the 
side away from the drive gear to hold the trip odometer in closer 
contact with the drive gear? I'd like to avoid removing the odometer or 
the trip odometer from the plastic mounts that they are in.