Well I wasted many hours by using water which I collected in a straw and let it run down the clothespeg. The object of the exercise was to try and capture it just before it fell off the bottom of the clothespeg. The problem was it was so uncertain and usually I pressed the shutter too late. The easy way to do it was that instead of using water was to use glycerine (not nitro glycerine). This is because it is so much thicker and will slowly build up at the bottom of the clothespeg before dropping off. Now you know.