Iambic Paddles remix

Really enjoyed building ReallyBigTeeth's iambic paddles, but I was having some issues getting the return spring to stay put. My solution is to add a little nub inside each recess on the paddles so that the end of the spring can't slip out.

I also added some stick-on rubber feet to the finished paddle. They help keep it from sliding away on the table. The feet also protect your table in case the screw heads stick out a bit.

Depending on your materials and setup, it can be difficult to ge