Throwing Star of David

Step 2 Lay next layer of blades atop the first.

This is tricky because the blades like to slide around on you. You can use Scotch tape to pin down the corners but remember that if you are welding the heat will melt the tape, which is perfectly OK. It would just be necessary to clean off the sticky goo with some laquer thinner, gasoline, or any other solvent, but wait until it has been quenched or cooled.