Hi Sunra1081. You need to make sure that the blade hold-down is sitting on top of the lip on the blade holder. You also need to make sure that when you are tightening the blade hold down that you tighten it down firmly. Just be careful not to break or strip out the screw. Another thing you should consider is how much of the blade is sticking out of the blade holder. You may need to adjust the amount of blade tip that is protruding out of the blade holder. Double check the downforce your machine is set to as well. Hope this helps. If not, let me know and I will put further thought into this. Good Luck!