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