Before I climb the stairs to install, I suggest the following. This allows you to sit down and perform some of the actions suggested at the table. Find a cylindrical object that is slightly smaller in diameter than the drainpipes. It's really fun when all the pipes have the same diameter. Wrap the base of the screen around the cylinder and make an overall shape similar to that of the product image. Unfold the screen, trimming away most of the overlap and trimming will prevent the screen from overlapping too much, limiting water passage through the screen. You can then easily insert the lower end of the sieve into the tube if you have used a sufficiently small cylinder. Take the shield off and adjust if necessary to ensure a snug fit. This saved me a lot of time on my roof. I don't like using my extension to climb stairs or work on a roof without a bystander. This saved me and the observer a lot of time.
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