How to change attachment in the grapple hook script

i dont know how to change the attachment in the grapple hook script to my left hand.

script:

--Grapple hook script that utelizes the mouse to create a rope that will use a winch to act like a Hook.

local Player = game.Players.LocalPlayer
local HumanoidRootPart = Player.Character:WaitForChild("HumanoidRootPart")
local Mouse = Player:GetMouse()
local Debounce = false
local mouseDown = false

local Max_Distance = 300 -- This is the max length that the grapple hook can get to
local WinchSpeed = 500 --Winch Speed.
local RopeVisible = true --Is the rope visible?
local RopeColor = BrickColor.new("Institutional white")

-- Calculate the distance between two Vector3 objects and round to the nearest ten
local function distance_between_vectors(u, v)
	-- Calculate the difference between the two vectors
	local difference = u - v

	-- Calculate the magnitude (distance) of the difference vector
	local distance = difference.Magnitude

	-- Round the distance to the nearest ten
	distance = math.floor(distance / 1 + 0.5) * 1

	-- Return the rounded distance
	return distance
end

local function Attachment(method, parent)
	if method == "Create" then 
		local Attachement = Instance.new("Attachment")
		Attachement.Parent = parent
	else 
		parent.Attachment:Destroy()
	end
end




Mouse.Button1Up:Connect(function()
	mouseDown = false
end)


Mouse.Button1Down:Connect(function()
	mouseDown = true
	if Debounce == false then 
		Debounce = true
		local HitPosition = Mouse.Hit.p
		local distance = distance_between_vectors(HitPosition, HumanoidRootPart.Position) --Fires our function above passing the two vectors
		if distance <= Max_Distance then --If distance is smaller then Max_Difference run the code below
			local NewPart = Instance.new("Part") --Creates a new part 
			NewPart.Anchored = true --Makes the part anchored
			NewPart.Parent = game.Workspace --Moves it to the workspace
			NewPart.Position = HitPosition --Moves the part to the position 
			NewPart.Transparency = 1
			Attachment("Create", NewPart)
			Attachment("Create", HumanoidRootPart)
			local Rope = Instance.new("RopeConstraint")
			Rope.Parent = NewPart
			Rope.Attachment0 = NewPart.Attachment
			Rope.Attachment1 = HumanoidRootPart.Attachment
			Rope.WinchEnabled = true
			Rope.WinchTarget = 5
			Rope.WinchForce = 1000000000
			Rope.Restitution = 0
			Rope.Color = RopeColor
			Rope.Visible = RopeVisible
			Rope.Length = distance / 2
			Rope.WinchSpeed = WinchSpeed
			while mouseDown == true  do
				wait()
			end
			Attachment("Destroy", NewPart)
			Attachment("Destroy", HumanoidRootPart)
			NewPart.RopeConstraint:Destroy()
			NewPart:Destroy()
		end
		Debounce = false
	end
end)

Instead of HumanoidRootPart try use the left arm, I can’t remember the exact name, you’ll need to check that

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