I was pleased with the operation od the secondary latch handle. I had copied another builders spring loaded ball mechanism in order to keep the handle in position and avoid locking me out. I couldn't get it to work, but I found a nice part at McMaster Carr that could work (5901A36). It requires a larger delrin block because of it's length. That is no problem, I have delrin stock, drill press and I am building a freakin airplane. I can do this !