You need to register for each weapon
PHP Code:
RegisterHam( Ham_Item_Deploy, "fwReplaceModels", 1);
PHP Code:
RegisterHam( Ham_Item_Deploy, "weapon_knife", "fwReplaceModels", 1);
RegisterHam( Ham_Item_Deploy, "weapon_m4a1", "fwReplaceModels", 1);
RegisterHam( Ham_Item_Deploy, "weapon_ak47", "fwReplaceModels", 1);
Or you can make an array like in the link you gave and then loop through it