I made mine with nylon cord, large old fashion diaper pins, and wine bottle corks. Make a hole in the cork and pass the cord through and tie it off on both sides of the cork. Then figure how long you want them and tie the other end to the saftey pins. Since we have had our kids in the last 5 years and drink alot of wine I had everything on hand when the idea hit me. I have since made a new batch using the plastic corks that some manufactures use in their bottles. These should last forever. I usually do not get a chance to cull lots of keepers, but, this system makes it quick to get the slots out of the well.