Regarding the tempo wheel,
Hi Doron.
I had this problem on my KN2000 and it was very bad. it worked when it wanted to.
Embarrassing when gigging.
I levered the wheel off it comes off quite easy.
I then put a little WD40 onto the spindle enough to run down the spindle and refresh the contacts and it has worked fine ever since.It's over three years since I did it.
Regards.
Joe