On another topic when you feed in a top bar it helps if you have an extra follower board that's too short or has a couple holes in it. Then you can put a syrup can on the other side of it for the bees to get to. I made a simple wood stand the jar fits into so the bees can walk under it and get syrup. As long as they have a bar free, they don't usually build burr comb around it. This give you two advantages. You have put the syrup in a protected place and it's easy to get to without disturbing the hive. Also the heat the bees generate will warm the syrup making it more appealing to them (not an issue if your in a warm area). Here in Seattle it's usually in the 60s...