The idea of the wedge top bar is to clamp the wax foundation in so it doesn't fall out from sagging caused by the heat from the hive and weight of the bees. You can use the grooved top bar(intended for plastic foundation) with wax foundation if you melt beeswax and run a bead of it to glue the foundation in to the top bar. The bees will secure it to the bottom bar.
I bought a bunch from a guy that wasn’t using them anymore. I cut the extended wire off the crimp wire foundation I had and put a small bead of Tite Bond III to glue it in. When I ran out of foundation, I glued in 1/2 a paint stir stick for foundationless frames.
I use grooved top and bottom bars with wax crimpwired (no hook) foundation here in central FLorida. I DO cross wire the frames. Temps are not an issue done this way. If you happen to have crimp wired w/hooks just cut the hooks off and proceed placing the foundation in your grooved frames. Good Luck.
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