There is an oak strip on the bottom that fits SNUG in the miter slot in the saw top. It slides easy with a little candle wax on it but it doesn't wobble. That is probably the hardest part for most people to make. It's important that it fits well.

Once that is installed I run the jig through the saw to trim it flush with the blade.

The toggle clamps are available in a lot of places. Most woodworkers suppliers carry something similar. I think I searched Google Shopping and found these rather cheap. Since they don't see a lot of use I used cheaper ones. They can be pricey but the best ones are made for industrial use too.