The top bar is split, but there is no gap. Foundation is loaded by use of a jig that opens the split so foundation can be inserted. When removed from the jig the bars spring back to hold the foundation until the two sides of the split can be stapled. The type of frame top bars that have a gap are just about worthless as it is very difficult to get a good hold on the foundation after it is inserted.
A forum community dedicated to beekeeping, bee owners and enthusiasts. Come join the discussion about breeding, honey production, health, behavior, hives, housing, adopting, care, classifieds, and more!