I used my R-tech TIG to fix my knackered horn on the 110. It had stopped working and I assumed this was due to dirty internal contacts after wading.
Anyway turned current on the TIG to minimum and then connected it across the terminals of the horn, quick press of the pedal and a nice strong beep from the horn. Popped it back in the 110 and it's worked ever since. I'm guessing the HF start on the TIG was enough to break through the dirt on the contacts, whatever it was it worked.