Paul from SWISCO responded:
August 6, 2019
Thank you for posting. Start off with taking a look at our S770-28 channel balance. Does look like your balance? If so, then you will need the stamping on your balance to pick the option you need. If there is not a stamp on your balance, then you will need to weigh your sash on a scale, and refer to the sash weight chart located on the product to decide on the most appropriate option. |