Apart from being an excellent shooter, Geko is known as a fine slingshot craftsman and played hig part in popularizing the slingshot sport. Quite a few tricks of the trade - such as the "Mocrophone Chrony", the Constrictor knot to attach bands to the pouch, the way we attach bands to an over-the-top-slingshot without a knot - were introduced by him. It is worthwile to take a look at his slingshots, even more at his Youtube Channel, where a lot of instructional videos can be found.
Old slingshots (using tubular bands)
Second Generation: Board cuts
Second Generation: Metal / Fimo slingshots