It can be made from a skein of wires.

2.Jerk of a chimneyist, a cleaning metallic.

It can be made from a skein of wires.

4.Weight with a fastener ring 2.5 kg.

Nobody does specialized weights. You can use the usual athletic. Or use part of the dumbbells by adding a hook to it. If the chimney is curved or narrowed (in order to find out just a video examination is required), the weight should be less in diameter than the narrowest place, otherwise it can get stuck in the chimney and you have to disassemble it.