This is a kill switch "paddle" for the DW-745. I have the model without this "paddle" and it can be a bit iffy turning the saw off. This solution is designed so that it doesn't require any modifications to the saw. And it's very easy to install.
The bracket is made from a piece of sheet metal, I used aluminium as I had a piece. The drawing for the bracket is ment to be used as a template for cutting and bending the part.
The author marked this model as their own original creation.