No lock off kits for the old polo as far as I'm aware mate. There's a timing mark on the cam pulley and one on the inside of the cam belt cover. Remove the cambelt cover,take out the plugs, rotate the belt till these marks line up, then gently wedge both pulleys with something like pieces of soft wood. You will find things a lot easier if you loosen the offside engine mounting and jack the engine up at that end. Drain the coolant system then you can remove the waterpump. I'd replace with OE parts; pump and belt from any 1.3 90-94 will do. About £45. Secret of success is to be as gentle as possible so as not to disturb the pulleys. No Haynes specifically for the G40. Have fun.