I tried this SWISCO part (
26-150) on my 22 year-old Loewen double hung windows to replace the pivot pins that broke in a similar way to the original post and... they worked! Only one original screw fits rather than two, so probably not as secure. But the windows now open and close and pivot. I am not a pro, these parts interface with parts that are in tension in the sash. I needed to pry them down with a flat head screw driver to get them level. Felt like I was about to break something but got them in a level enough position, reinstalled fold out windows, and they work again :) Now to order 5 more sets for the other windows that are either already broken or about to fail...