The tool is for holding the original pulley in place so that you can get the bolt undone. As I mentioned in my earlier post the bolt is VERY tight and you need a lot of force.
The "boss/block" is part of the engine block. Due to the different design of the original pulley and the RSS pulley this boss is in the way of your new pulley and has to come off, you'll see! Use a hacksaw, much easier than a Dremel or such.
Basically totally easy to do, bolt is the hardest part....
Good luck!
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'14 Boxster
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