when trimming facings a bent blade will leave the edge up and avoid the "chopped look" of being cut down at an angle. The top side of the blade is just the right thickness IMO that when coupled with the feather strip is an easy way to see if the cloth will be held in tight. If you can pull the blade and feather strip out easily the cloth may be an issue later.
The Bracket is a profile gauge. You can copy any profile from any table with it. Bend as needed and now you have a template. Make a bracket for each rail and now you have a bevel history. On the top side you can use it as a defined protractor to copy pocket angles. I think you get the idea. Make a bracket for every kind of table you work on. Then with a digital protractor you can see anything you want. It also is good for a few other things.
Well I guess noone wants to add any of their things so I will stop adding.