Did you know that you can greatly increase the vacuum hold down by surfacing your sacrificial MDF cutting surface? MDF has a protective sealant on both sides of the board limiting the airflow created by your vacuum and causing less than sufficient material hold down power. First surface the top of the MDF board, then flip the board over and do the same to the other side. You will be amazed at the increase of material hold down force. Keeping a nice flat cutting surface is crucial to productive routing, every so often you should resurface your sacrificial MDF to get the most out of your CLN Router.