Article: Threaded headsets have one continuous metal piece (stem) that comes up out of the frame, bends forward, and then attaches to the handlebars. There is a nut where the stem leaves the frame that holds it in place and one bolt at the top of the stem. These stems are easy to adjust and are common on single-speed, fixed gear, and older bikes. Some bikes do not have a hex nut by the frame, and just have the bolt on the top of the stem. This bolt, pointing straight down, creates the pressure that holds the stem in place. Use an Allen key to loosen in, though your don't need to remove it entirely. Disengage the hex nut, which is the "ring" where the stem meets the bike frame, by loosening it with a wrench. You may need to wiggle, twist, and pull to get them out. If this is a new bike, mark the location where the handlebars used to rest with a marker or measurement so that you can return to this location if you need. Clean off any gunk on the stem with soapy water and then dry it with an old rag. To prevent the stem from getting stuck in the frame later on, apply a little anti-seize grease around the bottom 2-3 inches of the stem. Proper handlebar positioning largely depends on the type of bicycle you're using. That said, the number one concern when picking a height is rider comfort. You should put the handlebars where you can comfortably ride every time.  Road bike: Handlebars on racing bikes should be slightly lower than the seat to provide optimum aerodynamics and control at high speeds. Mountain bike: Mountain bike handlebars should be lower than the seat. This gives you a lower center of gravity and better balance when negotiating rugged terrain. Cruiser: Handlebars on standard bikes should be slightly higher than the seat to limit strain and provide maximum comfort. Hand tightness should be fine, especially with the top bolt. You don't want to crank on the bolt, making it so tight that you can't remove it later.
Question: What is a summary of what this article is about?
Know if you have a threaded headset. Loosen the bolt on the top of the stem. Loosen the locknut with a wrench. Pull the handlebars out of the frame. Wipe down and grease the stem lightly. Consider the kind of riding you'll be doing when deciding a new handlebar type. Place the stem back at your desired height and tighten the hex nut and top bolt.

Problem: Article: A film development kit will come with all the chemicals you need to develop your photos. The kit also comes with a development tank with a spiral loaded inside so you can easily load and unload your film strips. Make sure the kit you buy is meant for black and white photography.  Development kits can be purchased at photography supply stores and online. Development kits for color film will not work for black and white film since they use different chemicals. If your undeveloped film comes into contact with light, then it could cloud your negatives. Pick a laundry room or bathroom that doesn’t have any windows. Cover the cracks between the door and its frame with weather stripping, masking tape, or towels.  Wait a few minutes before working in your darkroom so your eyes can adjust. If you don’t have a room that’s lightproof, you can also purchase a film changing bag that you can put your supplies in without exposing them to light. Do not use a red light in your darkroom. Even though it’s seen in movies, it could affect how your film develops. Make sure all of the lights are out before you start working on your film. Hold the film canister upside down so the flat edge faces up. Hold the edge of the bottle opener to the end of the film canister and pry the cap off. Dump the roll of film into your hand. You can also use a film canister opener to access your film. Buy them online or at specialty photography stores. The leading end of the film is slightly narrower than the rest of it. Pull out 2–3 cm (0.79–1.18 in) from the leading end and use a pair of scissors to cut a straight line across the film. The spiral looks like a large spool that sits inside of the development tank. Feel for the protrusions along the edge of the spiral’s interior to locate where the film channel starts. Pinch the end of your film strip and pull 10–15 cm (3.9–5.9 in) of it into the channel directly underneath the protrusions. Rotate the sides of the spiral to feed the rest of the film onto it. When you reach the end of the film, cut the end with a pair of scissors. Many film spools can be pushed or pulled apart to adjust for different film sizes. The development tank is a lightproof container where you’ll mix the developing chemicals. Set the spiral on the bottom of the tank so the film is on the side. Place the lid on top of the tank and screw it on to secure it in place. Once the film is secure in the development tank, then you can turn the lights on again.
Summary: Get a film development kit for black and white photography. Work in a room without visible light so your film doesn’t get exposed. Open the film with a bottle opener in the darkroom. Cut the end of the film with a pair of scissors. Feed the film into the slot on the film spiral. Seal the film spiral in the development tank.

INPUT ARTICLE: Article: Use your web browser to go to a video streaming website, such as YouTube.com. Type the title or description of a video into the search bar at the top of the browser window.  Do so by clicking in the search bar at the top of the browser, clicking on Edit in the menu bar, and clicking on Select All. Then click on Edit once again, and click on Copy. Type "savefrom.net" in the search bar at the top of the browser and tap ⏎ Return. It's just below "savefrom.net" in the browser window.  Doing so inserts the YouTube link into the text field. It's the blue button to the right of the link you entered. It's in the lower-right corner of the window. Click the text to the right of the green "Download" button that appears below the link you entered. Doing so opens a menu of available video formats and qualities. Tap on a quality to select it. Doing so opens a dialog box in which you can rename the file if you like.  It's the blue button in the lower-right corner of the dialog box. The video has been downloaded to your computer for offline viewing.

SUMMARY: Go to a video streaming website. Search for a video. Click on a video to select it. Copy the URL for the video. Go to SaveFrom.net. Click in the link field. Click on Edit in the menu bar at the top of the screen. Click on Paste. Click on >. Click on download video in browser. Select a video quality. Click on Download. Select a save location. Click on Save.

You can find compressed air cans at office supply stores, electronics stores, and online suppliers. Test it by aiming it downward and pressing the nozzle down. Get a feel for how much air comes out with each spray. Purchase a can with a straw for increased accuracy. Screw the thin straw onto the nozzle of your compressed air can. Give it a test by aiming it downward and pressing the nozzle down. The air should blow from the tip of the straw.  Tighten the straw if you can feel air coming out of the sides of the nozzle as you spray. Skip the straw if you're comfortable aiming your compressed air can without it.
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One-sentence summary --
Purchase a can of compressed air. Connect the straw to the nozzle of the can to improve accuracy.