How to fix Limbs?

I made a weld script that welds the arms to a fixed position, right. So I want to be able to take off the weld and reattach it to the motor like regular, any idea?

heres the weld script

local player = game.Players.LocalPlayer
player.CameraMode = "Classic"
body = player.Character
local cam = game.Workspace.CurrentCamera
if cam:FindFirstChild("LocalBin") == nil
    then
    local bin = Instance.new("Message")
    bin.Name = "LocalBin"
    bin.Parent = cam
end

function onselect()
    wait()
    bin = cam:FindFirstChild("LocalBin")
    weld = Instance.new("Weld")
    weld.Name = "RightArmWeld"
    weld.Part0 = body.Torso
    weld.Part1 = body["Right Arm"]
    weld.C1 = CFrame.new(-1.3,0,0)
    weld.Parent = weld.Part0
    ----
    package = "SR-33_WeldInfo"
    base = script.Parent.Handle
    model = Instance.new("Model")
    model.Name = "FakeGun"
    model.Parent = script.Parent.Handle
    if game.Lighting:FindFirstChild(package) ~= nil
    then
    bag = game.Lighting:FindFirstChild(package)
    bag2 = bag:GetChildren()
    for i = 1, #bag2 do
        items = bag2[i]
        cp = items:GetChildren()
        for i = 1, #cp do
            if cp[i].ClassName == "Part" or cp[i].ClassName == "Seat"
                then
                clone = cp[i]:Clone()
                clone.Anchored = false
                clone.CanCollide = false
                clone.Parent = model
                weld = Instance.new("Weld")
                weld.Part0 = base
                weld.Part1 = clone
                weld.C0 = items.C0.Value
                weld.C1 = items.C1.Value
                weld.Parent = base
            end
        end
    end
    end
    --Welds--
    chicken = script.Parent.Handle.FakeGun:GetChildren()
    for i = 1, #chicken do
        wait()
        base = body["Right Arm"]
        bc = chicken[i]
        weld = Instance.new("Weld") 
        weld.Part0 = bc
        weld.Part1 = base
        baseposition = bc.Position
        newbaseposition = CFrame.new(baseposition) 
        C0 = bc.CFrame:inverse() *newbaseposition
        C1 = base.CFrame:inverse() *newbaseposition
        weld.C0 = C0 
        weld.C1 = C1 
        weld.Parent = bc
    end
    --Local Welds--
    package = "SR-33_LocalWeld"
    base = script.Parent.Handle
    if game.Lighting:FindFirstChild(package) ~= nil
    then
    bag = game.Lighting:FindFirstChild(package)
    bag2 = bag:GetChildren()
    for i = 1, #bag2 do
        items = bag2[i]
        cp = items:GetChildren()
        for i = 1, #cp do
            if cp[i].ClassName == "Part" or cp[i].ClassName == "Seat"
                then
                local clone = cp[i]:Clone()
                clone.Anchored = false
                clone.CanCollide = false
                clone.Parent = bin
                local weld = Instance.new("Weld")
                weld.Part0 = clone
                weld.Part1 = base
                weld.C0 = items.C1.Value
                weld.C1 = items.C0.Value
                weld.Parent = clone
            end
        end
    end
    end
    script.Aim.Disabled = false
end

function ondeselect()
    script.Aim.Disabled = true
    a = cam:FindFirstChild("LocalBin"):GetChildren()
    for i = 1, #a do
    if a[i].ClassName == "Part"
        then
        a[i]:remove()
    end
    end
    for i, v in pairs(script.Parent:GetChildren()) do
        if
            v.Name ~= "Handle" and v.ClassName == "Part"
            then
            v:remove()
    end
    end
end

script.Parent.Equipped:connect(onselect)
script.Parent.Unequipped:connect(ondeselect)
script.Parent.Clicked:connect(onclick)