A Welding Problem?

I keep trying to get this brick to weld into my arm, and it moves me to the center of the map. If I don't move from the center, then I don't get stuck with the arm in the ground. If I do move from it, it moves me back to the center and I'm stuck for the duration of the move. Can anyone help?

--variables used
Player = script.Parent.Parent
local me = game:service'Players'.LocalPlayer
repeat wait() until me.Character
PlayerGui = me.PlayerGui
local char = me.Character
char:WaitForChild("Body Colors")
run = game:GetService("RunService")
RightArm = me.Character["Right Arm"]




-- excerpt from script
x1 = Instance.new("Part")
			x1.Parent = RightArm
			x1.BrickColor = Colour
			x1.Material = Magy
			x1.Size = Vector3.new(math.random(2,3.5),math.random(2,3.5),math.random(2,3.5))
			x1.Shape = "Ball"
			x1.Anchored = false
			x1.CanCollide = false
			x1.FormFactor = "Custom"
			ownerobj = Instance.new("ObjectValue")
		ownerobj.Parent = x1
		ownerobj.Name = "TagObj"
		ownerobj.Value = me
			a = Instance.new("StringValue")
		a.Name = "Owner"
		a.Value = Player.Name
		a.Parent = x1
			w1 = Instance.new("Weld")
			w1.Parent = x1
			w1.Part0 = x1
			w1.Part1 = RightArm
			w1.C0 = CFrame.new(0,-0.8,0)
			dmg1 = script.dmg:Clone()
			dmg1.Parent = x1
			dmg1.Disabled = false