Abstract: A method and apparatus 10 for installing and trimming a plurality of wooden mounting blocks 110 within a roughed out door frame 100 to prepare the roughed out door frame to 100 to receive a finished door frame: wherein, the apparatus 10 includes a pair of vertical standard units 11 11′ connected together by a pair of horizontally adjustable spreader units 12 12′ that are adapted to cooperate with one another to conform to the outside dimensions of the finished door frame; wherein, each of the vertical standard units 11 11′ is provided with a plurality of router templates 27 and means for plumbing each vertical standard unit relative to one of the vertical studs 101 101′ in the roughed out door frame 100; such that the wooden mounting blocks 110 can be glued to the vertical studs 101 101′ and then trimmed using the router templates 27 so that the trimmed mounting blocks 110 are perfectly aligned to receive the finished door frame.

Abstract: A method and apparatus 10 for installing and trimming a plurality of wooden mounting blocks 110 within a roughed out door frame 100 to prepare the roughed out door frame to 100 to receive a finished door frame: wherein, the apparatus 10 includes a pair of vertical standard units 11 11′ connected together by a pair of horizontally adjustable spreader units 12 12′ that are adapted to cooperate with one another to conform to the outside dimensions of the finished door frame; wherein, each of the vertical standard units 11 11′ is provided with a plurality of router templates 27 and means for plumbing each vertical standard unit relative to one of the vertical studs 101 101′ in the roughed out door frame 100; such that the wooden mounting blocks 110 can be glued to the vertical studs 101 101′ and then trimmed using the router templates 27 so that the trimmed mounting blocks 110 are perfectly aligned to receive the finished door frame.