CFrame Problem + Welds

[RoBoPoJu]

local RunService = game:GetService("RunService")

local targetLookVector = part1.CFrame.LookVector

weld.C1 = CFrame.new()

while part:IsDescendantOf(workspace) do
    local part1Pos = part1.Position
    local targetCf = CFrame.new(part1Pos, part1Pos+targetLookVector)
    weld.C0 = part0.CFrame:Inverse()*targetCf
    RunService.Stepped:Wait()
end