How do I make the part stick to the player's arm?

I've been trying for over a week to figure this out, I tried dozens of methods and none of them work. Right now I managed to make the part shoot out of my arm properly when I stand still, however when I move around it won't stick to the arm.

ReplicatedStorage.RemoteEvent.OnServerEvent:Connect(function(player)
	local righthand = player.Character.RightHand
	local humanoidroot = player.Character.HumanoidRootPart
		wait(0.5)
		local Beam = ServerStorage.BeamPart:Clone()
		Beam.Parent = game.Workspace
		Beam.Anchored = true
		Beam.CFrame = righthand.CFrame + humanoidroot.CFrame.lookVector * 1.5
		Beam.Parent = game.Workspace
		Beam.BrickColor = BrickColor.new("Bright orange")
		Beam.Size = Vector3.new(3,3,3)
		Beam.Material = Enum.Material.Neon
		Beam.CanCollide = false
		Beam.Massless = true
		Beam.Transparency = 0
		local weld = Instance.new("Weld")
		for i = 1,10 do
			wait()
			Beam.Transparency = Beam.Transparency + 0.1
			Beam.Size = Beam.Size + Vector3.new(0,1,0)
			Beam.CFrame = Beam.CFrame + humanoidroot.CFrame.lookVector * 0.5
		end
end)