I haven't messed with the guard cuirass specifically, but in similar cases that I have seen the exposed arm is actually a part of the chest armor's .nif, even though it's bare arm. So the suggestion that the problem stems from the heavy-bodied *_1.nif being used for the cuirass while the *_0.nif (or a blend between the two sizes) is being used for the gloves is where I'd start looking, too, as the arm morphology is ultimately defined by the cuirass meshes (in fact, in the third screen shot it's quite clear that the modded body/arm on the left is considerably more burly than the un-modded anatomy on the right). I'd make sure your *_0.nif for the cuirass is there, is indeed a different, thinner version and not just a straight copy of the *_1.nif, and is set up properly so that it's actually being used by the engine. It's fairly easy to accidentally overwrite one or the other with the wrong version and wind up with both weights being identical (Another thing you might check is that you don't have your *_0.nif and *_1.nif reversed, such that the 0 which should be skinny is burly and the 1 which should be burly is skinny. I've never made that particular dumbass mistake, but I've made plenty of others...) --Dreogan