You could easily end up with a mess doing what you suggest. In that situation, they may build the comb off one or both edges of the bar. Also they may build comb that isn't straight down the middle of the bar but curves. Either way you could end up with weird comb spacing or bars you cannot push together without mashing comb or violating bee space.
Save yourself the headaches and make some guides. Even with the guides they sometimes get creative...
Save yourself the headaches and make some guides. Even with the guides they sometimes get creative...
