Why doesnt my weld set properly?

I am creating an equip script for a sword. My sword doesn't set its Coordinate Frame appropriately. I don't know if this is a problem with the weld or the :PivotTo() function.

Here is what I have going on:

    local PlayerArm = character:FindFirstChild("Right Arm")

    local newSword = weapons.Sword:Clone()
    newSword.Name = "Sword"
    newSword.Parent = PlayerArm

    local Handle = newSword.PrimaryPart

    local newWeld = Instance.new("WeldConstraint")

    newWeld.Name = "HandConnecter"
    newWeld.Part0 = PlayerArm
    newWeld.Part1 = Handle
    newWeld.Parent = PlayerArm

    local adjustedCFrame = PlayerArm.CFrame * CFrame.new(0,-1,0) --Lower the sword

    newSword:PivotTo(adjustedCFrame * CFrame.Angles(0,math.rad(90),math.rad(90)))