Aluminium mesh solves the gap issues at the bottom of the feeder and a larger patch over the top stops them coming out when you take the roof off
Agree design of the original was flawed, but the feeders are cheap and I thought it worth a try. I made the following mods having sought advice from a fellow forum member.
1. Levered out the original dividers. Stapled a piece of wood to the bottom of each to prevent the bees getting underneath but allow the syrup to flow and be accessed by the bees. The aluminium mesh solution above would work just as well.
2. Cut some small castellations in the central walls to let the bees access the syrup. If you don't do this, your cover will rest on the central walls and prevent access of the bees to the syrup.
3. Cut up one of the old thin clear cover boards to fit only over the central bit between the two dividers, preventing the bees flying up when you take the roof off. I use a couple of drawing pins to hold this in position.
I have used my versions on two hives this autumn and they have worked perfectly with very few dead bees. I haven't floated anything on top of the syrup to prevent drowning and can't comment on the problem of building brace comb yet.