The first thing you need to do is find your base arm. This is the arm you will glue to your miniature and will act as a base for all your weapon choices. I have selected a Chaos Space Marine Bolt Pistol arm. I like this arm because it is pointing forward instead of across the models chest. This will make it work with a wider variety of weapons and will be easier to magnetize because you won't be so worried about angles.
The next step is to carefully lop of the pistol and clean up the hand.
Once you have done that insert a magnet into the hand. Note the color coding on the magnet. This makes it easy to keep track of which polarity is showing.
Next time I will show you the steps for the weapon itself.