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You have to remove the metal pin beside the adjustment wheel to take apart the upper section of the hop up unit.
There will be two plastic pieces and a spring. The nub is seated on the plastic arm and can easily be removed.
While you have everything out, you can install your new shredder spacer as well. I'm currently experimenting with mine atm but you might want to use a bit of hot glue to hold the spacer in place.
There is a thread on here describing how to install the SCS, just seach around for it if you need more info.
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