I had a minor spiking problem with my momo, so I emailed logitech australia never got a reply, phoned them and got the run around till I got through to service area, but I actually got to receptionist in service not service personel, she told me ( under warranty) I had to return the lot to place of purchase , I got these from interstate via internet so that's really not an options I told her.
She said well that's what you need to do, goodbye. Logitech Australia has NO customer service or a clue how to treat customers IN my opinion
We can only drool at stories of free full kit replacements without old set being returned, you guys are lucky
ShannonN