it showes the arms not even attached to the body
I'm going to go on a limb here and guess that you mean the mod "general's sabers". The mod to give the general grievous model two extra arms with sabers. Well there is no way to fix that since they are made to float. You could download the model of grievous that has four arms model on to it already. It's at jk2files and I even think it's in the top downloads of the week still.