The speedometer lost its mind the other day, and in the process, broke its needle from the stem. I didn't see it happening, I just noticed at some point in cruising that the needle was gone and the stem didn't know which way to point at. Also, one screw of the face detached from the body and the face hung loose inside the case from only one screw. As I heard lamentatious whining from the speedo, I already ordered a new cable.
I dismantled the speedometer, found the loose screw, and the rest of the needle. The face is now in place, and what is left of needle, glued on the stem. All the gearing looks okay and visually everything works fine.
There are two challenges.
Because the needle is shorter than before, it doesn't reach the stopping (the pin at zero kilometers per hour reading) and can go below zero. Is it essential for the calibration of the needle to rest against the pin at zero for it to stay calibrated? Now the calibration of the needle is off, and the needle points to the 6:30 o'clock while resting.
Also, it seems like an impossible job to find spare needles anywhere. The part isn't listed separately in the parts catalog (ETK). Where would you begin hunting for one? I found a restored speedo for 350 euros, but it sounds like a lot of money for a needle...
The bike is 1979 BMW R45.
Edit: I'm not sure if it's only a matter of calibration. Today during the riding, half of the time speedo showed about 50 km/h, half of the time 180 km/h. At one point it went into hibernation, and woke up after 10 minutes. Odometer and trip work normally.
Edit 2: It's water under the bridge. I found a used speedometer in ebay and won the auction. 🎉