28D USB balance

Question

Here are my photos....28D USB is the stamp on the side.

Paul · Accepted Answer

Hi there- thanks so much for your post!

From your photos the balance bottom shoe looks like our 15-005 that has a 1" depth, so you would order Series 380-29.

The spring weight for (28D) will be our (2840) for a sash weighing between 23-28 lbs.

Get back to us if you have any other questions.