Rub the finish off of the CARC unit or the hugger? Either way, in looking at the photo, it seems adjustable for a "free float" between the tire and the CARC.
I have the version from Skidmarx though, so no direct experience with the Agostini product.
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[You must be registered and logged in to see this image.]2012 MOTO GUZZI GRiSO 1200SE2013 MOTO GUZZI STELVIO 1200NTX - Orange Blossom Special