Our Standard T-Square works perfectly with any 2″ x 3″ Biesemeyer style guide rail system. However, sometimes steel tubing can be slightly oversized from the manufacturer. We have found that this is particularly common with guide rails that are provided on the Powermatic table saw. The oversized dimension is generally 1/16 inch over 3 inches making for a tight fit that requires a slight adjustment. The UHMW VerySuperCool Tools T-square glides are very thick and robust and allow for trimming to size for the perfect fit. This generally entails removing 1/32 inch on the spring steel glides and the flapper glide. This can easily be accomplished with a simple benchtop setup using a block plane and some scrap wood.
I the video below I show the method I use to accurately make this minor adjustment.