Small metal triangles that hold the glass tightly against the frame.
I went to the local hardware store with my dimensions. The guides suggested buying a glass cutter if I needed to trim it. I decided to let the pros cut it for me (best decision of my life). A single pane of double-strength glass cost me $12. A tube of glazing putty was $8. For under $25, I had everything I needed. Compared to the glazier’s quote of $175, this was an absolute steal.
If you are dealing with a more modern window or would like to learn about tools that can speed up this process, let me know if you want to explore: How to handle
Here is my review of the process based on the guides I found:
I decided to look up "how to replace a pane of glass" after an unfortunate incident involving a rogue golf ball, my backyard, and my garage window. The internet promised me this was a "manageable beginner project." I am here to tell you that the internet is a liar, but it also saved me $200.


