The mechanic of the net first in this thread looks like the one DAM in Germany used.I own a folding net which
works similar to this one shown.You have to push the"button" between the arms down and then you can fold
the arms back.
![Image](http://i176.photobucket.com/albums/w177/pueffel/IMG_0803_zps4b96ae3e.jpg)
The one down on the first picture is the one similar to yours,the picture down shows the mechanism of DAM.
Hope it helps....