This is mine.
I will post better pictures when I get the chance but they are very easy to make from:
£1 shop keep net
£1 shop crab line
and here is how.
If you have seen those £1 shop keep nets you will see that the are two section (three hoops) closed at the bottom and a draw cord at the top. Well I first take the large wight from the crab line and stitch it into the bottom of the keep net with some of the line.
next I cut the top 'cell' off just above the middle hoop and just below top one and retain the top draw cord hoop.
Stitch this hoop inside the net to the bottom one which more of the crab line to make the bait compartment (you can probably see that I keep the crab line in this compartment when not in use). finally stitch on the support line and weights which sink the hoop quicker. The idea behind this that it is less likely to drift off and settle flat on top of the base.