I think I finally understand what you're saying Miguel. Are you saying that there is a half inch or more of OPEN space directly behind the recoil pad, and then one encounters the filler block? So you did not cut any of the actual filler block at all? And the screws on the pad are long and reach all the way to the block, and the edges of the pad are kind of inset into the empty space?
If I am finally understanding you right it sounds as if shortening the stock is a piece of cake.
Am I smellin' what you're smokin' finally? ;o)

Thanks,
Rex