Not sure if this would fix your problem,but there are some gunsights which when pointed into the sun,do not glare,but act as if no sun is shining through them,and you can see a con just fine.
Maybe find that gun-sight,transpose your line sights onto it,or draw them onto it and TADA!!!!
A no-glare sight..
just dont be pointing that thing at me,and if you get it accomplished I would love to add that sight into my folder.
Falcon23
