I wouldn't have taken anything off the bottom of the lug.
I wouldn't have taken anything off the bottom of the lug.
Bee space. As I understand, you narrowed the end for less surface area glued to the wall. The bee space under the lug has now been increased so they could well gum up this area as well.
I think castellations in the brood box are the devil's work......rolling bees on every frame!
I had this problem in my MB boxes so all the frames get a little sawn off one end to make them a looser fit in the box. The extra space is not propolised, even by my sticky Buckies.