I attempted to set up for a Snelgrove split yesterday. I could not find the queen so we was unable to proceed. The hive is so built up with brood and bees that I will have to do a walk away split - probably split hive 3 ways.
I got some advice that I was making a critical mistake that contributes to inability to find queens. I have been inspecting the top box while it is sitting on the bottom box and then removing the top box to inspect the bottom box. I was told that this causes the bees to herd the queen to a safe area in the lower box. I should be removing and covering the top box first, inspect the bottom, and then inspect the top. This should prevent the queen from hiding so much.
Charlie