Yea you have a older craftsman, the newer model does not have plastic insert, its small rectangle hole, I had a skil with that junk plastic, I took some plywood and amzingly not cutting my fingers off made a wood solid insert then sanded till it was flush with the top, and with a hole big enough for the blade to go though, but still had a slot in the wood insert to remove it if needed with blade removal. In fact I have a wood over my table now anyway as my table loves to rust to easy, plus it makes it slicker to me, it also helps once get that one there get some johnsons paste wax, cab be found at lowes around the wood filler and paints, and stains its in a yellow can, put some of that on the wood it will make it like ice, helps with moving the wood around it just glides.