15 are aligned by passing bolts 17 through apertures 20 a in guide member 18 a and apertures 20 b in guide member 18 b in a repair or preventative maintenance application lintel 31 is an existing lintel in a new installation application lintel 31 is adapted to be supported by lintel support brace 11 and header 23 in the preferred embodiment support arm 27 carries a shim 29 disposed between support arm 27 and lintel 31 shim 29 is preferably secured to support arm 27 but not to lintel 31 to ensure that lintel 31 is able to u201c float u201d as needed due to thermal expansion and contraction proper floating of the lintel is undermined by bolting the lintel to the header as is being done in the industry today use of the present invention on an existing lintel either to repair a damaged or sagging lintel or as preventative maintenance will now be discussed the first step in the installation process of the present invention is to remove all or part of any existing door frame and molding not shown to expose either all or small sections of the top and bottom of header 23 adjusting means 16 is then adjusted such that top portion 13 and bottom portion 15 may be.