Cost to replace inside sliding door with new one?

Situation: a back door had an old mortise lock (metal box inside door) and a lock like the one shown at [URL="http://i.ebayimg.com/00/s/MzAwWDI3NA==/z/x3oAAOSwEK9T~4IL/$_35.JPG?set_id=2"]http://i.ebayimg.com/00/s/MzAwWDI3NA==/z/x3oAAOSwEK9T~4IL/$_35.JPG?set_id=2 [/URL] We are upgrading the door with a new door knob to replace the old mortise lock and adding a deadbolt on the door. The door jamb has been damaged, probably due to past forced entry. We considered having a contractor repair the door jamb; I discussed the project with two contractors who leaned toward extensive replacing of door jamb structure on the latch side of the jamb. We decided to keep the cost down by installing a large entry door strike plate of the type shown at [url=http://www.lowes.com/pd/Gatehouse-Steel-Entry-Door-Strike-Plate/3407896]Shop Gatehouse Steel Entry Door Strike Plate at Lowes.com[/url] The person who hastily installed the strike plate made some error in placement and some adjustment is needed. In other words, the screws were not drilled exactly where they should have been drilled. Drilling holes right next to existing holes is not feasible; it would, obviously, be hard to drill and would result in screws not holding well. I thought of an idea. Perhaps larger holes could be drilled where the poorly placed screw holes were drilled and then a dowel rod of a diameter (for snug fit) the same as the drill bit could be cut to the proper length and fit in the hole and the dowel rod be glued in the hole. After the glue dried, carefully placed holes for the screws could be drilled; these holes would actually be drilled into the dowel rods embedded in the door jamb. I was wondering whether this technique has been used by others; I searched and found that it has. See [url=http://www.woodweb.com/knowledge_base/Fixes_for_a_MisDrilled_Knob_Hole.html]Fixes for a Mis-Drilled Knob Hole[/url] I'm just wondering about selection of diameter for the dowel rods. And, should I try to position the rod plugs cut for gluing into holes so that actual screw holes would be drilled somewhat near the center of the plugs?

Bathroom window, it's not an older double hung with the pulley hung weights but a newer one that has inset aluminum counterbalance springs in the vinyl sides. The lower pane is broken and needs to be pulled to put in new glass. Here's what it looks like.... [url=http://s267.photobucket.com/user/thordehr/media/Mobile%20Uploads/IMG_1938_zpsgessacfr.jpg.html][/url] [url=http://s267.photobucket.com/user/thordehr/media/Mobile%20Uploads/IMG_1942_zpsaopgiait.jpg.html][/url] I don't see any fasteners holding in the vinyl slides. I can rattle the vinyl bit, and it feels like there's a fastener in there somewhere holding it to the side but I have no idea where it is... I don't see any way to secure the counterbalance, or any cutouts to pull the window from the sides. What am I missing?