[garyerrol]

On mine, I don't know if a piece is missing off the back but I have to press a piece, like maybe the plunger, back into place every now and then or my cruise control won't work either. You might trying feeling on the back of your lever to see if you have any exposed parts that need to be pressed back into place.

Like I said, I don't know if mine is normal with the open back or if the back is missing. Nothing falls out onto the floor, just one end of the plunger seems to swing out and needs to be pressed back with my finger.