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Once you get slider out, almost all rollers are held in place by same screw that holds frame corners together. So, you need to set panel on one side, remove screw in corner, flip panel over, remove screw on other bottom corner. Now, you can take a rubber mallet or wood handle of a hammer, and tap bottom frame off glass. This will give you access to your rollers. Take a close look at how they are inserted into door frame. In fact, it's a good idea to only remove one roller to bring with you to match for new ones. Then, when you get back home, you can use roller that is still in place as a guide to installing new ones.
Places like Home Depot, Lowes, and Ace Hardware carry about 80-90% of rollers out there. So, you should be able to find them. However, let's say this just isn't your lucky day, and you can't find your rollers anywhere. You are going to have to have them ordered. Bring roller to your local glass shop. If you're lucky, they will have them in stock. If not, they can order rollers, but you won't get them for about a week. Don't panic. Just go home and tap bottom frame back on door panel, but leave corner screws out. You can even leave roller out that you removed. Lift door back in place, install fixed panel but don't snap bottom piece back in, and don't install inside screws. Then, from inside house, lift slider and pull it closed. You don't want to drag it if you left roller out. It will scrape bottom track. Just lift it enough to take pressure off, and close and lock it.
When Your new rollers come in, take everything back out and install new rollers. Adjust new rollers all way up before putting door back in. That way, new rollers won't interfere with you lifting it back in place. Adjust new rollers down until door slides good and locks. You want to be sure there is an equal gap at top and bottom when door is about an inch from closing into side jam. You can adjust rollers to make this dimension even. If you can get job done by a professional for $50 or $60 including parts, it might be worth hiring someone to do it. But, in high population areas such as Los Angeles, it's common to pay $100 in labor only. Then they mark up cost of rollers, and you could wind up spending $130 for a job that you can do yourself for about $20. Next week i'm going to tell you how to repair your broken or defective window glass.
John Rocco has been installing replacement windows since 1978. To learn more, visit How To Install Windows