Reply To: How to plough a deep groove? Home › Forums › General Woodworking › How to plough a deep groove? › Reply To: How to plough a deep groove? 8 June 2018 at 11:26 pm #3568 Christopher JacksonParticipant IIRC, Paul has mentioned using a knife wall with the either the plow plane or the poor man’s rebate plane. That might help.