Or you can send it to Stevebfl here on the forum.
His shop fixes these.
W124 speedo/odo repairs are not for the feint of heart--
special tools/equpment are required.
We do a fair number of 126/107 speedos,
124's all go to Steve-- including the one from my 90 300CE.

__________________
Todd Haven
Parts Manager
MPH Automotive
Houston,TX