i posted this long ago then took it off and left .
Step 1: MATERIALS
A bicycle tire (the kind with spokes)
a windsheild wiper(the kind That is somtimes attatched to vehicles)
dremel tool or benchgrinder
some string(optional but fun to play with)
Some plyers (2 is fine)
and gogles(or you will have a lot of eye pain for a while)