first get a hammer just in case .....if your useing top hat grommit they rub on the guide and stop machine thats if it is that so i use paper towel just fold twice i use a critical so i know its not power sup ...have you oiled it checked no rubbing anywhere .....mm thats all can go wrong ...if none of those lets use the hammer that always works lol lol ......try that if dont work send him back to me i send new one out to you soon as you like