Sharp pair of scissors. Stab them right by the top and bottom to start the cut. Cut off the top and bottom and them trim up the sides to make what you want. I cut up a pop can this way the other day to make some shim stock.
04 KDX 200
01 GSXR 750
87 FZ 600 basket case
75 GT 550
68 Chevelle- trade for front motor digger