The cam tower is the entire assembly that holds the camshaft itself (the whole cast piece that says "PORSCHE" on it). I would release the tension on the t-belt, then remove the cam tower. There are 6 bolts hidden under the threaded metal plugs on the cam tower that you will need a long 6mm allen bit to get to.
Removing the cam tower is not a difficult process, though when removing it care must be taken to not drop the lifters inside it! Once the bolts are removed, the tower can be lifted slightly then "tipped" gently toward the pass. side of the car to help keep the lifters in place. If they do fall out, make sure they are returned to the same position they were originally in when the tower is put back on.
You will also need a new cam tower gasket to re-assemble it (around $10).
Here is the tutorial from Clarks Garage:
www.clarks-garage.com/shop-manual/cam-01.htm
Let us know how it goes!
-Nick
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