When the part I'm trying to weld to my hand is too big, I glitch out. Any thoughts?

This is a script I am using to weld a part (The parts name is "Middle" in the script) to my right hand. but whenever I make the part too big, I teleport to the parts location and my character freezes, Any thoughts? ps: "Rasenshurikan" is the model where the Middle part (the one I'm having trouble with) is located. Also this is my first question so please correct me if I'm doing something wrong.

local enabled = true

Player = game.Players.LocalPlayer
Character = Player.Character

local Service = game:GetService("UserInputService")

Service.InputBegan:connect(function(input, gameProcessedEvent)
    if not gameProcessedEvent then
        if input.UserInputType == Enum.UserInputType.Keyboard then
            if input.KeyCode == Enum.KeyCode.X then         
                if enabled == true then
                enabled = false
                local o = script.Rasenshurikan.Middle
                game:GetService("Chat"):Chat(Player.Character.Head, "Rasenshurikan!")
                local hum = Player.Character.Humanoid
                local Animation2 = hum:LoadAnimation(script.RasenshurikanAnim)
                local current2 = Animation2
                current2:Play()
                wait(.5)
            local g = script.Rasenshurikan:Clone()
            g.Parent = Player.Character
            local C = g:GetChildren()
            for i=1, #C do
                if C[i].className == "Part" or C[i].className == "UnionOperation" 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.Name = "Weld"
                Y.Part0 = Player.Character["RightHand"]
                Y.Part1 = g.Middle
                Y.C0 = CFrame.new(0, -5, 0)
                Y.Parent = Y.Part0
            end
            local h = g:GetChildren()
            for i = 1, # h do
                h[i].Anchored = false
                h[i].CanCollide = false
            end
            if enabled == false then
            wait(3)     
            Player.Character.Rasenshurikan:Destroy()
            wait(4)
            enabled = true
            end
                end
            end
        end
        end
            end)

If you need a visual representation of my problem, please go to this --> https://gyazo.com/4d6d6aabf0c6ef8aa7e81c2143c84033 Thanks! -A scrpting newbie