Sranek block and tackle window balancer

Question

Looking to replace four (2 paiirs) Stanek window balancers. C-channel is 30in long, 9/16in wide, 9/16in deep. The rivet holding the spring toward the top is centered 2-3/16in from the top edge. There are no plastic mountings on either end. Channel is only held in window by screw at top. The channel is stamped with '30D BSI'. The clip on end of cord looks like your 15-043. Sash weighs 28.2lbs.

Emily · Accepted Answer

Hello there!

Thanks for reaching out to us. It sounds like you may have the Series 770 channel balance. Photos of the balance removed from the window would allow us to be certain. Would that be possible?