Re: feeding bees in a topbar hive
I used the inverted mason jars with a little stand for them to fit into that I left in the hive. They worked okay, bees took it fairly slow.
I also tried straight sided jars with a tube of aluminum screen put inside to the bottom and then folded down over the top of the jar and secured in the recess there by a light weight wire. You have to be careful there are no holes or openings that the bees could use to get behind the screen. Fill it with syrup, throw some little pieces of empty comb on top for bee floats, and put it in the hive. They were able to take the syrup from that a lot faster. I did have to watch for robbing a bit more since it lets the syrup smell travel more than the inverted jar. You also have to watch it because they will start attaching the little comb peices if you don't get it refilled or out of the hive quick enough. They are quick to make and I could put a couple in if I was trying to get the syrup to them really quick to encourage comb drawing.
3rd yr - 1 KTBH & 4 KTBH nucs - TF - USDA Zn 6b