Guys,
I have a set sitting in front of me. Its a metal spindle molded into plastic. The actual threads are metal. The metal collar is imbedded into plastic for noise and corrosion reduction.
You just broke a peice of the outer plastic shell off. The insides of the “plastic” collar is aluminum.
I think they did this on all current INOX Stainless steel series coils. It has to do with German TUV standards and certification and performance on the salt spray test.
The plastic shelled spring seat prevents any galvanic corrosion between the steel spring and the aluminum seat. It also reduces noise any any potential spring binding.
I would not worry much. The coilovers exceed German TUV saftey specifications and has the certificate to prove it. Which is like a DOT specification in the US but more stringent. This is alot more than can be said about many other coils on the market.
http://www.uk.tuv.com/web/product_testing/automotive/02pt_automotive.html
I researched the crap out of these before I plopped down cash on them.
Some other intresting facts are:
-V1 Dampers are Koni Dampers
-V2 Dampers are Koni Valved in a KW stainless body.
-For strut models the brakets are not cut as a mirror image. They are cut identical. Meaning if your car uses a camber bolt. The passenger side camber bolt has to go in backwards to engage the cam lobe.
-If yours are equpiped with helper springs. They will compress solid under the weight of the car. Thier sole purpose is to allow height adjustment, additional rebound suspension travel, and to prevent the spring from popping.