I must have a dozen unbroken upper rails in my canopy junk box, but no
undamaged lower rails. Why? Because inexperienced pilots use the lower
rail to open the canopy and sooner or later, break it. Most ships have
a protruding lip on the canopy frame to grab when opening the canopy.
Cough up the $321 bucks, get new stuff and don't even touch the window
rails when opening your canopy.
JJ