I have a Revue Thommen Airspeed Chronograph (self winding, Valjoux movement with central elapsed minute hand) that needs some servicing. The watch keeps great time, but when I pull the stem out to adjust the time, it's difficult to push it back in. I have to play with the stem a little and would like to get this fixed.

Can anyone recommend a place to get authorized service within the US for this watch?

Thanks in Advance