I have old Pella double hungs and I need 2 block and tackle balancers. The stamp on it says it is a 3230
The metal casing measures 1/2" x 1/2" and the block and tackle and pulley is on the top . The top of the balancer slides into a notch in the top of the jamb and the bottom is screwed to the side jamb
Can you help with this
Thank You
Bob