All, Many thanks to ShipKiller for his fine instructions on top removal and motor replacement on the wife's Z4. It took about 5 hours counting time for the water proof job on the motor housing. A friend of mine (former FBI agent / so anyone can do this) assisted in this job. This task looks much tougher, really simple. However, some of the clips and mountings are a PITA to get to on the car. Highly recommend tapping several layers of paint tape (Blue) or (Green/Frog) on the paint surface around the edge of the top....or you will end up with scratches even if you're very, very careful. Also, another hot tip...tape down the locking bars on the front of the top so they don't hit the plastic on the Driver / Passanger roll bar covers, they are very easy to scratch. (Don't ask me how I know this now!!!) All in all, pretty happy with my results and much cheaper than the 3.5 K I was quoted here in the National Capital Region (Washington, D.C.) to repair the problem by the STEALERSHIP!!! Zdaneman sends I'll post a few pics later.