Pivot Bearing - Removal of cup.

Hi guys.
I am REALLY stuck on the removal of the cup so I can swap my pivot bearings. Bike is a Gary Fisher Cake 2 but I think it is the same setup as some Trek's.
Basically I need to remove the allen key in the photo below:

Which will then allow this cup to come out of the other side and give me access to the bearings:

However when I undo the allen key, the whole cup spins and as such will not undo.
Does anyone have any ideas on how to undo this allen key without the cup spinning.
Really hope someone can help!!
Thanks,
Carl.
I am REALLY stuck on the removal of the cup so I can swap my pivot bearings. Bike is a Gary Fisher Cake 2 but I think it is the same setup as some Trek's.
Basically I need to remove the allen key in the photo below:

Which will then allow this cup to come out of the other side and give me access to the bearings:

However when I undo the allen key, the whole cup spins and as such will not undo.
Does anyone have any ideas on how to undo this allen key without the cup spinning.
Really hope someone can help!!
Thanks,
Carl.
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Posts
dont they both screw together?
Parktools :?:SheldonBrown
Parktools :?:SheldonBrown