Trying to make a script to make custom body attachments? [READ DESC]

I have made a script to make a custom tail spawn onto a player but one thing is it don't work in the output there is no errors but the tail is not there I have made it able to weld I think,

local T = game.Players.LocalPlayer.Character.Torso
local K = game.Lighting.Kagune

function onSpawn()
local kag = K:Clone()
kag.Name = "Tail"
kag.Parent = game.Workspace
wait(0.001)
kag.Parent = T.Parent
local Weld = Instance.new("Weld")
Weld.Parent = K.WeldPart
wait()
Weld.Part0 = K.WeldPart
Weld.Part1 = T
end

game.Players.PlayerAdded:connect(function(player)
    player.CharacterAdded:connect(function(onSpawn)
        end)
    end)

If you can help thanks.