I used 3m double sided vhb tape on my windows. The windows are very secure, and the tape sealed the window well.
I think it's a cleaner look without the fasteners.
There is only 40 hrs. on the airframe but so far there is no air leaks or other issues.

If you use this method, make sure you clean the area well and be very careful with the placement cause once it sticks, you're done!

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