Help with ent attachment.

[Gmod01]

So i'm kind using a couple addons together to make a new swep. So I need a prop to be stuck to the players head when function SWEP:PrimaryAttack() and when the player dies the prop needs to be removed. This is what I got so far.
function SWEP:Deploy( pos, ang )
if SERVER then
       self.Weapon:SendWeaponAnim(ACT_VM_DRAW)
    timer.Simple( 0.5, function()self.Weapon:SendWeaponAnim(ACT_VM_PRIMARYATTACK)end)
if IsValid(self.ent) then return end 
self:SetNoDraw(true)
self.ent = ents.Create("prop_physics")
self.ent:SetModel("models/vinrax/props/scp035/035_mask.mdl", RENDERGROUP_OPAQUE)
local ply = self.Owner
local backBone = ply:LookupBone("ValveBiped.Bip01_Head1")
local bonePos, boneAng = ply:GetBonePosition( backBone )

boneAng:RotateAroundAxis(boneAng:Up(), 0)
boneAng:RotateAroundAxis(boneAng:Right(), 0)
boneAng:RotateAroundAxis(boneAng:Forward(), 0)

self.ent:SetPos( bonePos + Vector(0,0,0) )
self.ent:SetAngles( boneAng )
self.ent:SetCollisionGroup( COLLISION_GROUP_WORLD )
self.ent:Spawn()
self.ent:Activate()
self.ent:SetParent(ply)
end
return true
end

You can see from the pictures the prop spawns and is attcahed to the player but its not attached to the head. Im not good with lua so any help would be greatly appreciated.