How to make welds to NPC's?

Is it possible? In the older versions of Garry’s Mod this was possible, but why was it taken out? And is there some sort of mod or something that can allow me to do this?

  1. Its not possible im afraid.
  2. I have no idea. Possibly source engine limits/crashes.
  3. Maybe. Search garrysmod.org for npc weld.
    http://www.garrysmod.org/downloads/?a=view&id=8729