Make sure all 4 shapes are flat, you can use parallel pliers or a steel block and mallet. Sand the sides and the base of the wire shapes and arrange them so they are evenly spaced and so the 90° bends all fit together in the middle with a small hole right in the center. Cut 4 small solder pieces, I used wire solder as it fits perfectly in the groove between the 2 sides of the wire shapes. Flux the wire shapes and the solder. Heat the whole piece until the solder just begins to melt so the pieces are held together by the solder and then turn the piece over and continue to heat so the solder flows through from the front to the back. The solder is drawn to the heat of the torch. Normally I would solder on a titanium rack and heat from underneath the piece and the solder would flow down towards the heat of the torch, but for this project you need the even, flat surface of a soldering board to get the pieces fitting properly together.