I just tried the guards as shown in the pictures by Warstud and Donald. There was a problem. The eavestrough I want to protect is about 30 feet long and it has to have a reasonable slope to drain. At the low end of the trough, the guard has to be on such an upward slope towards the roof that you can't really tuck them under the shingles without causing them to lift. My roof has a relatively low slope. I tried bending and cutting them. Just didn't work. I took them back.