I need some help with my left handed tool?

Code:

script.Parent.Equipped:Connect(function()
    local chr = script.Parent.Parent
    print (chr)
    local lh = chr:WaitForChild("LeftHand")
    local part = script.Parent.MeshPart
    local l = Instance.new("Weld")
    l.Part0 = lh
    l.Part1 = part
    l.Parent = lh
end)

I don't how to change its position and its rotation, I've tried changing grip but it doesn't work. Please help!