A customer is wanting his sycamores topped, they are four boles close together and his concern about the trees is that in the last wind storm the tops moved a lot in the wind and they are concerned that the tree would fall. They asked that the trees be topped 30 feet down from the top (about 120 feet). I told them that a crown reduction this year and the next year would be good. So I have only done a type of crown reduction that involves the power lines. So advice on how to reduce/thin the crown so the possibility of falling is decrease.