1 Coat Hanger
1 Paper Clip
Keep in mind solder is a bonding material and not so much a filling material. So it can tricky to work with. Also, solder is softer the steel so it will file off faster.
Step 1: Strip a coat hanger
CAUTION! If you do it this make sure to hold the wire before you turn the drill on. Otherwise the section of wire will turn into a whip / weed wacker. Be careful and work within your experience.
Step 2: Make Rings
File the free ends of the paper clip rings so the close with a nice fit.
Step 3: Solder
Apply flux to the areas where you want the solder to bond. Use a heat source to solder.
It may take a few applications.
Step 4: Make the blade
Cut three pieces and solder them together. File the pieces to remove tool marks.
Step 5: Finish the soldering
Lay the key flat and but the blade up against the shaft. Solder it on. Be careful no to use too much heat or the soldered blades will come apart.
Clean up the excess solder. I used a combination of a rotary tool bit, a file, and sand paper. Polish with polishing compound and a buffing wheel.