No tilt double hung wooden window hardware

Thanks for your post! The window balance you have here is the S751-31. It has a ribbed channel and a 15-014 Knife Lock Shoe.

Our 30HD stamp will support a sash weighing 23 to 29lbs.

The clip attached to the rivet, at the top, is the 19-030 Long S-Clip. It is sold separately from the balance.