I was reading in one of the catalogs about frame spacers. I'm useing a SBB and was going to limit my brood box to 8-frames, and 9-frames in my shallow suppers. I am doing the 8-frame to help eliminate mites, and just let the mites fall to the ground from the hive box. I used no medication in my hives, and they are wintering well, with plenty of stores. It lookes like i will get to spit the hives next month. I saw a devise for $15.00 that you just run between the frames to evenly space for the configuration of the number of frames you want. Is there any pro, or cons on useing such a devise, verses the nail in type spacers?