Thingiverse
Acorn window spiral balance sash stop by mrblob
by Thingiverse
Last crawled date: 4 years, 11 months ago
This thing replicates part 33002 - a piece of plastic that goes into the top part of the window and holds the spring rod in place. Acorn went out business, so a replacement might be hard to find. This part seems to be close, but the dimensions listed on the site seem to be a bit off.
https://www.swisco.com/Window-Stop-Black/pd/Spiral-Balance-Retainers/55-063
https://www.swisco.com/Window-Stop-Black/pd/Spiral-Balance-Retainers/55-063
