had to convert some frames yesterday. they are the 'nuc' that i recently purchased, which were on National Brood frames. I have got modified commercial brood chambers, so the bees were building a lot of burr comb. I converted 4 of the 5 frames to stop this, but left one for the building of 'drone comb' as part of my I P M of the colony.
all good fun, eh?
;)