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One steel with a cap, one aluminum without, one beefed up aluminum one with a bolt (not a proper flat surface, just a 8.8 bolt) and then the knock off of the Perrin unit with "stronger" aluminum.
Man on man.
Seems like the only thing getting people over the GS is that little cap.....you can source these online to fit over the end of the Perrin unit, however this defeats one of the purposes of the bolt Perrin decided to use on there units.
Also worth mentioning, unless the end of the master and the cap used are perfectly flat (both matted machined surfaces) there will be room for movement between the two pieces. Easy way to test is mount the unit and use some feeler gauges around the edges of the cap and see how one side opens up and the other side tightens down under pedal application.
I have both units used by customers and have tested this but failed to get it on video. When the car comes in again I will grab a video of this.
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