How do i Mold a Sword on a Players Back?

I am making a game and i want it so when you step on a brick it puts a sword on your back. The script i have now is buggy and rotation is off every time, so can anyone help fix it. The sword is a union. I want the sword slanted when it is on your back.

Script:

local De = false
script.Parent.Touched:connect(function(hit)
    if hit.Parent:FindFirstChild("Humanoid") then
    if De == false then
        hit.Parent.HumanoidRootPart.Anchored = true
        repeat wait() until hit.Parent.HumanoidRootPart.Anchored == true
        local R = hit.Parent.UpperTorso.Orientation.X
        De = true
        local Sword = game.Workspace.Swords.Starter:Clone()
        Sword.Parent = game.Workspace
        Sword.CFrame = hit.Parent.UpperTorso.CFrame - hit.Parent.UpperTorso.CFrame.lookVector
        Sword.Orientation = Vector3.new(45,R,0)
        print(Sword.Orientation)
        Sword.Orientation = Vector3.new(45,R,0)
        local v = Sword
            local Player = hit.Parent
            print(Player.Name)
            local weld = Instance.new("Weld")
            weld.Part0 = Player.UpperTorso
            weld.C0 = Player.UpperTorso.CFrame:inverse()
            weld.Part1 = v
            weld.C1 = v.CFrame:inverse()
            weld.Parent = v
            v.Anchored = false
            print(Sword.Orientation)
            hit.Parent.HumanoidRootPart.Anchored = false
            wait(1)
            print(Sword.Orientation)
            wait(4)
            De = false
            end
    end
end)

Thanks for helping!