[62benly]

Yeah, I did something similar to what spokes described in order to zero out the odometer. I carefully un-crimped the metal bracket to get into the innards. The inner gasket crumbled to pieces so I cut a new one out of bicycle tubing. When I was trying to fit the bracket back around everything the glass broke, I was using cramps to get everything lined up, the class broke when I tried some tap taping with a rubber mallet (not recommended).

I think once I get a new glass piece figured out I can do it again but much more carefully.

The odometer was pretty difficult to reset but after lots of trial and error the numbers turn smoothy and it works great.
The gears and such were very rusty so dripped a bit of chain lube around too.