My windows are like 45/50 years old. So hard for me to get a picture as they are very brittle.
Describing the cross section it has a flat bottom of 1/4" not including the part that goes into the wood. Then goes from the left end at an 11:00 o'clock direction for approximately .100" then continues at an 10:00 o'clock direction for 5/16"
Material is plastic.
Please advise,
Ken