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Badly cut top bars are the cause of most problems that can
happen when using top bar hives.
If the top bars are cut correctly and waxed well, bees will build
one comb on one top bar. This allows the beekeeper to harvest
easily and move combs between hives to manage bees in a
similar way to frame hives.
Basic Beekeeping Manual 1: How to make a Moveable Comb Top Bar Beehive (© Author Pam Gregory, who offers
this as her gift to beekeepers in developing countries)