So you just removed his weapons and made some new ones?
Well, I suggest to remove his weapons and save, now import him back into the map..
Redo your weapons, but only your weapons in your model program, rotate them in the right direction, and save them as well, and now just attach them, should defenitly work..
else I would download some claws, there are some cool ones out there =)
just remove the normal weapons of the troll..