in fig7 with the exception that a plurality of notches 60 are provided in the sloped walls 56 59 notches 60 may be provided to effect a rear wall anchor formed by patching compound 30 which with the repair plug 62 presesed inwardly into window 55 is excreted or pressed through notches 60 to generally form a knob or rear anchor plug 61 of beaded patching compound 30 rear anchor plugs 61 serves to provide increased holding of repair plug 62 within window 55 another feature of the present invention is also illustrated in fig1 this feature is the ability to utilize a repair plug 62 having a thickness different for example 3 4 inch from that of the drywall 41 for example a 5 8 inch plasterboard or sheet rock drywall with reference now to fig1 another advantageous feature of the present invention is shown at times a homeowner or other user may be presented with a large damaged section 49 in drywall 41 to repair or replace the large damaged section 49 only a portion of which is shown template 10 is placed over a first portion of the damaged section not shown and a partial window 65 may be formed with use of saw 28 next template 10 is relocated or disposed over the remaining portion of the damaged section 49 with the upper guide rail 23 overlapping or extending beyond.