I need the same balance you guys did for Pennco windows in the below post(S770-34 with the bottom clip swapped out for your 62-105 hook) except I have one sash that weighs 21.6lbs and another that weighs 28.2lbs. I require one for each sash...Can you send me a Quote? https://www.swisco.com/discussions/Replacement-parts-or-counter-balance-for-Pennco-windos-77-100865
Tom from SWISCO responded:
July 11, 2019
Sure, it sounds like you need a 34B stamp for the 21.6 pound sash and a 34D stamp for the 28.2 pound sash. I'll email you an order link and price quote right now for one of each.