Used to remove bees from buildings. Wound up with 50 hives at one time. CHARGED to remove them. Did no repairs as I was too busy removing bees. Finally got novice beekeepers to go with me and take bees. The simplest way to get a swarm to stay in hive body is to add a frame of brood. The girls aren't going to leave babies alone. Best way to prevent swarms is have a young queen (less than 3 years old.) This means requeening every couple years.