Paul from SWISCO responded:
October 22, 2014
You can order your replacement balances with winged fittings for the top and bottom. The wings help keep the balance centered for easy installation of the sash and helps with the performance of the sash movement. See our S385-22 with a stamp option of 2130 and our S385-28 with a stamp option of 2730. If you needed to, you could also simply clip the wings off of the shoes.
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