I just make pop ups using my usual boilie basemix, slightly upping the flavour, use the whites of the egg only, and added egg white powder (from the baking isle in Tesco) and wrap it around 10mm cork balls, they produce baits of 12mm or so. By only using the egg white and added egg white powder produces a harder skin to them, I make them as one egg mixes, which will produce a small number of baits, once airdried in the airing cupboard for a few days, will last in an air tight tub for a fair while. I use bait floss to attach them, they donโt pierce with a needle, (well they will, but a piece of cork may break off and punch a large hole in the bait, plus breaking the skin on the bait allows water ingress which will break the bait down.) I drop each bait in a glass of water as I make them to check their buoyancy.