My only input is that when you get them assembled and on the shaft, make SSSUUUURRRREEE that each blade is under the proper amount of spring tension. If one is under what seems to be too little tension, believe me, it is, and you have to dis-assemble and adjust to get the proper tension. If you don't you'll have a blade fly open on release, and they don't fly worth crap with one blade deployed. Trust me on that... it cost me a lot of money. Once you get them adjusted right, they're awesome.