I have a question for you guys who also do holiday lighting. I have a customer who wants christmas lights put on the roof. In the past I have used paper clips which have worked pretty good. This customer doesn't really want the paper clips under her shingles as she just had them replaced about a year ago. Do any of you have any ideas as to keep the lights on the roof? I doubt she wants any kind of clips up there either. Thanks for any help you can give!