Simply extract to ns\models\player\heavy, for example: C:\Program Files\Valve\Steam\SteamApps\accountname@example.com\half-life\ns\models\player\heavy
This is a simple recompile that brought the animations to 3.2 standards(afaik the model used 2.0 anims before that).
v1.1 restored the original welder anims.

Credits:
created/edited by Monolith & Bots
Edit by NrvsYet
Real Skins by Delarosa
Animated by ???
