My click to morph script does not work properly?

What am I doing wrong?

local plr = game.Players.LocalPlayer
local mouse = plr:GetMouse()

function onClick()
if plr.Character:FindFirstChild("RightArm1") == nil then
    local g = script.Parent.Parent.RightArm1:Clone()
    g.Parent = plr.Character
    local C = g:GetChildren()
    for i=1, #C do
        if C[i].className == "Part" or C[i].className == "UnionOperation" or C[i].className == "WedgePart" or C[i].className == "MeshPart" then
            local W = Instance.new("Weld")
            W.Part0 = g.Middle
            W.Part1 = C[i]
            local CJ = CFrame.new(g.Middle.Position)
            local C0 = g.Middle.CFrame:inverse()*CJ
            local C1 = C[i].CFrame:inverse()*CJ
            W.C0 = C0
            W.C1 = C1
            W.Parent = g.Middle
        end
            local Y = Instance.new("Weld")
            Y.Part0 = plr.Character["RightUpperArm"]
            Y.Part1 = g.Middle
            Y.C0 = CFrame.new(0, 0, 0)
            Y.Parent = Y.Part0
    end

    local h = g:GetChildren()
    for i = 1, # h do
        if h[i].className == "Part" or C[i].className == "UnionOperation" or C[i].className == "WedgePart" or C[i].className == "MeshPart" then
            h[i].Anchored = false
            h[i].CanCollide = false
        end
    end

end

mouse.Button1Down:connect(onClick)