Hi Carl,
I have started using the Hotech flattener with my ED120 recently. I have attached a link to a previous thread. If you go down that particular thread, I have attached some images of the "corners" as well as images with and without the flattener in place. The images were taken with my QHY8L.
http://www.iceinspace.com.au/forum/s...ad.php?t=80765
Hope this helps.
Cheers,
Daniel