Reliable Bone Positioning?

[Kunit]

Does anyone happen to have a procedure for finding reliable / linear bone-positioning for attachments?

Tried using LookupBone in a few different scenarios but every ragdoll appears to spew different results ending up with a malformed position / angle. Need a way to find a localized position for all player-models so that I can attach the 'items' without having to setup unique offsets for each player-model. EyePos and AimVector appear to be unique to player-model as well.

	ply:SetModel("models/player/kleiner.mdl")
	print(ply:LookupBone("ValveBiped.Bip01_L_Shoulder")) --Valid Bone / HL2
	
	ply:SetModel("models/player/guerilla.mdl")
	print(ply:LookupBone("ValveBiped.Bip01_L_Shoulder")) --Invalid Bone / CS:S
	
	ply:SetModel("models/player/zombie_classic.mdl")
	print(ply:LookupBone("ValveBiped.Bip01_L_Shoulder")) --Invalid Bone for this model / Zombine HL2

Result of attaching with a single offset to multiple player-models via LookupBone. Zombie doesn't even have a shoulder node apparently.
[img]http://s30.postimg.org/hlg620apb/inv.png[/img]

Thanks for any assistance as I have not been able to find much through searching, feel free to link me to any resources as well.

[Aide]

IFAIK Almost everytime I and anyone tried to do something like this we all ended up creating offsets for certain models.