For those occasions when the keepnet adjuster is lost, broken or worn-away. We provide a replacement answer with our multi-position net adjuster.
This is not a total universal fitting, as it might not fit certain types of top frames. But with the majority of alloy top frames it should be OK. 
Just needs a couple of self-tapping screws (not provided) to screw and lock into position on the alloy net frame. (screw type shown in photo)
Note* Fits Rectangular Frame Tube only Aperture: 7mm x11mm Approx