The split jamb installed dead square plumb and in line with each other. This doorsize jig allows you to rout a perfect rough opening on any type of door. If i m removing the doors from the jambs before installation i tack a spreader across the legs to maintain the opening and i cut with a chopsaw paired with an outfeed stand to support the jamb.
Fast Precise Door Frame Installation Without Wedging Or Shimming And Requiring Very Little Training This Is What The Jambmast Jig Door Installation Door Frame