Web5 days ago · pry the door jamb with a pry bar. Use a pry bar to carefully remove the door jamb. Work slowly and methodically from the bottom to the top to avoid damage to the. Webfind door jamb kits at lowe's today. Shop door casing kits and a variety of moulding & millwork products online at lowes. com. Webrecommended installation instructions for 2 exterior door jamb extension kits. This kit converts a 4 9/16 jamb to a 6 9/16 jamb. Carefully pry or cut off existing brickmould.