Well, I will try to post a short video. A gentleman named Jerry Sells made a number of these and I got this one fom him. My impression is that it takes some work to make it function correctly.

[image][IMG]http://i1102.photobucket.com/albums/g460/cordite_lee1/th_20170610_153458_zpsikjqoeaq.mp4[/IMG][/image]