Every table saw should have these. If you own a table saw you will benefit from making a pair of these. Even if you don’t cut full sheets of plywood, these arms can be helpful when using larger table saw sleds. Click here for a free diagram of my exact setup. Mine is made for a SawStop PCS table saw with the industrial mobile base. Adjust according to your needs.
If your saw doesn’t have a square tube front rail, don’t worry. You can make one for just about any saw out there. Just scribe a block to fit the rail profile and cut it as thin as possible to still be allowed to glue to the top of it. Then size the rail for the distance between the top of the scribed block and the table surface. That’s your rail thickness. Everything else should be straight forward building.