This is a 1950s table saw model 113.27520 by sears craftsman.
Originally it uses a splitter as a safety feature against kickback. This is my cardboard test at adding a simple riving knife to an old craftsman 113.
The knife stays at a fixed distance from the arbor. It is not lowered below the table surface but if you do such a mod then you can prepare 2 knifes, one tall and one short and use the one that suits the job.
