According to the CPSC, even using (listed) twist-on connectors to attach copper pigtails to older aluminum wires as a "temporary repair" requires special installation procedures, including abrading and pre-twisting the wires. However, the manufacturer's instructions for the Ideal no. 65 Twister only recommends pre-twisting the wires, and does not state it is required. Also, the instructions do not mention physically abrading the wires as recommended by the CPSC, although the manufacturer current literature states the pre-filled "compound cuts aluminum oxide". Some researchers have criticized the UL listing/tests for this wire connector, and there have been reported problems with tests (without pre-twisting) and installations. However, it is unknown if the reported installation problems were associated with unqualified persons attempting these repairs, or not using recommended special installation procedures (such as abrading and pre-twisting the wires as recommended by the CPSC for older aluminum wire, or at least pre-twisting the wires as recommended by Ideal for their connectors).