Paul from SWISCO responded:
December 19, 2017
Thanks for writing in, Nelson. Let's start with your top sash guide. See if you could make our 18-180 work for you. Usually, our S380-28 channel balance goes along with that guide. Between our S380-28 and our S385-28 channel balances, the subtle difference lies within the depth of the bottom balance shoe. For our Series 385, the shoe depth is 1-3/32" and for our Series 380, the shoe has a depth of 1". At times, I have known service people in this predicament to file down the two humps to make the shoe have a 1" depth.
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