The slot on the Hammer/Felder saw slider is not the same as a conventional cabinet saw being a C section with the C laid on its side so it is wider at the bottom and the opening is smaller on top. I had a bit of an idea tonight and found that 18mm T track will go into the slot easily and 22mm will go in if it is given a rub to remove a very small part of its thickness as it is size for size. This will obviously allow clamps and jigs to be used without mucking around making something to fit in the slot.