Bob from SWISCO responded:
May 17, 2019
Thanks for posting. See our 15-192 Pivot Shoe. This is compatible with our Series 170 and Series 171 Coil Balances. If you have two coil balances on each side of the sash, the Series 171 has a longer tongue and is meant to stack on top of the Series 170. I believe your spring designation '405S', in which case you require either the S170-405 or S171-405. Let us know if you have any questions. |