After shimming my GC I noticed a lack of any appreciable pressure between the stock ferrule and front band. I noticed contact between the GC and inside of the stock just behind the ferrule so I relieved this area with a rotary file and for good measure I removed paint from spot where the ferrule mates with the front band. Now the contact point between the ferrule and front band is perfectly centered but with only a light squeeze of my hand can I deflect the front of the stock and create a gap. The lock up on my fiberglass stock seems weak so my next project might be shimming the pivot point, hopefully that should increase pressure on the front band. Has anyone experienced a similar situation with fiberglass stocks?