This was being discussed on another thread, so as I was making some up I took some pics. I'm not convinced they are any better than the deer hair flies, but they are certainly a change bait if the fish are wary, as they seem to have become of late on my local. They are also a bit more bouyant, so are good in bad conditions or failing light, or if you are like me, 3 parts blind!
Take your supermarket wine cork and trim the outer to form a roundish cylinder about 1/2" diameter:
Cut a chunk about 15mm long, this is one I trimmed up too soon, but its not neccessary. Hooks are Maver MT5 size 8, and I bend the gape out slighty for this ( top hook ).
Stand your biscuit on end, and slice it to leave 2 sides, you can disguard the middle bit which should be about 2-3mm wide. When done create a groove for the hook to sit in. when you have a good fit a small blop of glue to hold the hook in place:
Create a small infill fillet from some waste material and glue it in, you can be generous with the glue here:
Trim any fillet from the flat face, and glue on the other rounded half you saved from earlier:
Using nail clippers, trim to give nice rounded edges, this one just needs a bit of glue residue removing from the hook:
Here are some floating. The one in the middle is an enterprise tackle zig-rig floater done much the same way, but it sits much lower than the cork ones. The real biscuits shown are not actually chum mixers, they are some I was given, and sit quite a bit lower than unsoaked chum mixers.
This is one of my earlier ones from a while back. What I did here was banded a real chum mixer to it, to work on the principle that surface tension will hold loose offerings together. Whether it's any better I don't know, but it snared me a couple of doubles when I tried it. Bit weighty to cast, but seems to work. The newer cork biccy would be better for this as there is more exposed hook: