As long as your insert sits evenly in the throat (doesn't wobble, and doesn't project-esp. the front lip- above the table surface, I wouldn't worry about not having the front clip. Remember that whatever piece you're cutting will be (or should), be on the table/insert surface by the time it meets the blade, so it's holding down the insert. Depending on the design of your table, I think of a few alternatives to the front clip. If there is a threaded hole in the front ledge supporting the insert, drill a corresponding hole in your insert and screw down with a countersunk screw. If your table is steel or iron, you could glue a small magnet to the bottom of your insert; if aluminum, glue a magnet to the table, and fasten a strip of steel to the bottom of your insert. If all else fails, you could jam some slips of cardboard in gaps between the insert and table, to provide a friction fit (not too elegant, but should work!) Good luck.