Mingjo,
I'm using both the PMCA repeating bait trap and Uncle Blaine's repeating sparrow trap.
I did have to modify my PMCA repeating trap though. One day I put a male HOSP in the PMCA trap that I had caught on a glue trap. I watched him from a window and he managed to pull the tripping cage back down with his beak and jump in and escape.
I cut out a piece of wood just slightly larger than the square hole through which they exit the tripping cage and drilled a 2 1/4" hole in it. Then I stapled a piece of hardware cloth cut just a bit bigger than the hole over the hole - only stapled at the top on the holding side of the cage, so that the hardware cloth could be "pushed through" or would lift up when a bird pushed through the hole.
The birds can't lift the screen back up to get to the tripping cage (although I think Harley Hamm has had 1 instance of a male doing this). The bird is in such a panic when the cage drops that they're looking for an escape hole. Even though the screen is over the 2.25" hole he still pushes through it, the screen then drops and you have him! It's very important to have the hole in the wood - it delineates the escape hole better than just using screen.
I mounted the whole mechanism to the inside of the cage using some wire and drilled holes in each corner of the wood - a few twists and it was in!
It works the same as Uncle Blaine's sparrow trap. By the way, the absolute best "bait" is a female HOSP. Second to that, young fledglings (catch them with cheap millet seed from Walmart), next - nest material & feathers - lots & lots of feathers. Of course, YMMV - you have to keep trying different things if you don't have a female yet.
I have caught about 8-10 males. Do fledged males look the same as an adult male? Seems like an abnormally high ratio of females to males.
