Hello!
Happy new year from Italy.
Today I tried to install my new momo sphere AirMetal

<img src="http://www.momo.it/Momo/pomelli/grandi/sphere/sphereairmetal.jpg">

Now I have a really big problem.

Following the http://www.supremepower.com/tipmod.html I installed the SSP TipMod and the Momo Knob but after I can't remove my key.

WHY?
What's it wrong?

It sounds like the knob is not fully rested down. Hence the car does not think it is in park and will not relesase the key because it thinks you are between gears.

I make a tip adapater for the tiptronic, some of my customers have experienced the same problem. It usually as RSform suggested. Possible cause is tightening the grub screws too much so that the adapter doesn't move freely on the shaft.