Part needed for Sokkia SDL 30 level

One of my SDL 30's has a bad button for initiallizing the measure routine. It is the blue silicon button on the RH side. apparently there is a small rubber disc on the back side of the button that is metalically treated that closes the circuit. Mine is worn out & the unit only works by utilizing a data collector.

I can fire the mease. routine by using a paper clip across the contacts, so I know the switch is OK.

Anyone have a dropped (parts) level they would be willing to scavange the part off?

Sokkia no longer makes the part!

Thanks for any assistance.