You can also use any other thin metal object, like a needle for smaller knots. Just be careful not to pierce and damage your string.
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One-sentence summary -- Get an ordinary corkscrew.


A bug in Creative Cloud 2015 and 2017 products prevents the "Photoshop" option from appearing in Bridge if either Photoshop or Bridge is out of date. You can update both of these programs by doing the following:  Open the Creative Cloud program. Click ⋮ in the upper-right corner. Click Check for App Updates  Click Update All if prompted. Keep in mind that updating doesn't always fix this problem. If your programs are both updated to the 2017 version, consider deleting and reinstalling Photoshop and Bridge, or use Photoshop's Scripts instead. Once you've finished updating both Bridge and Photoshop if necessary, restart your computer by doing the following:   Windows — Click Start {"smallUrl":"https:\/\/www.wikihow.com\/images\/0\/07\/Windowsstart.png","bigUrl":"\/images\/thumb\/0\/07\/Windowsstart.png\/30px-Windowsstart.png","smallWidth":460,"smallHeight":460,"bigWidth":"30","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of a Windows icon.\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Public_domain\">Public Domain<\/a><br>\n<\/p><\/div>"}, click Power {"smallUrl":"https:\/\/www.wikihow.com\/images\/5\/5d\/Windowspower.png","bigUrl":"\/images\/thumb\/5\/5d\/Windowspower.png\/30px-Windowspower.png","smallWidth":460,"smallHeight":460,"bigWidth":"30","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of a Windows icon.\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Public_domain\">Public Domain<\/a><br>\n<\/p><\/div>"}, and click Restart.  Mac — Click the Apple menu {"smallUrl":"https:\/\/www.wikihow.com\/images\/f\/ff\/Macapple1.png","bigUrl":"\/images\/thumb\/f\/ff\/Macapple1.png\/29px-Macapple1.png","smallWidth":460,"smallHeight":476,"bigWidth":"29","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of a Mac icon.\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a><br>\n<\/p><\/div>"}, click Restart..., and click Restart when prompted. In order to speed up the process of opening your selected images in Photoshop, both Bridge and Photoshop should be open. Click a photo location on the left side of Bridge, then hold down Ctrl (Windows) or ⌘ Command (Mac) while clicking each photo that you want to open as a layer. It's a tab in the upper-left corner of the Bridge window (Windows) or your Mac's screen (Mac). A drop-down menu will appear. This option is near the bottom of the drop-down menu. Doing so prompts a pop-out menu to appear. If you still don't see Photoshop in the Tools menu, you may need to use Photoshop's Scripts instead. You can also try deleting and reinstalling both Photoshop and Bridge. You'll find this option in the pop-out menu. Clicking it prompts Bridge to send your selected images into Photoshop, where they will be organized into one project as multiple layers. Once Photoshop displays your new project with your photos displayed as layers, you're free to close Bridge and begin working in Photoshop. You can switch between the individual layers by clicking the one that you want to view in the "Layers" window that's on the right side of Photoshop.
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One-sentence summary --
Update both Bridge and Photoshop. Restart your computer. Open both Bridge and Photoshop. Select photos in Bridge. Click Tools. Select Photoshop. Click Load Files into Photoshop Layers…. Wait for your photos to finish importing into Photoshop.