[Geoff]

You'll kick your self when you see what it is, as I said before, the principle is used on numerous tool,s, you've probably got one in your own shed. With just a little work, you could quite easily make this your self. A clue, Carpenters use it, Plumbers use it, Tilers use it, Painters use it, Glazers use it, Builders use it, have I said enough?.