2130 WM

Looks like your message got cut off. If you're wondering about the shape of your attachments, as far as the blunt ends, that won't make a difference. Just pay attention to the wings (or lack of wings) on both sides and see if this is one of our half-inch channel balances. You still need to weigh the window sash and measure the metal bar to choose a balance, once you've identified the balance Series.