Crap...I managed to snap the lumbar support knob... I have a seat with working knob.

Now gurus help me out. How to remove the knob and install it to another seat?

Tilt the backrest part of the seat forward, at the bottom of the backrest you can see metal rings that close the upholstery. Cut them and you can get your hands in the seat. Take the bits out and have a look at them. Change the bits that need changing, and put it al back again. Close the seat with som tie-wraps.

umm...do I have to roll up the leather to get to the parts?