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I have a high end mouse and it'd be silly throwing it away or even sending it away for a chance to be fixed in weeks when one could just replace the cord with at most some soldering.

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Is it the cord that is broken? – Pekka Jan 16 '11 at 17:26
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I'm unaware that there are replacement cords, but you can always buy for example USB A-B cable (or A-whatever), cut off B side and use the A side as a replacement cable. The greatest difference between USB cables is if cable has shield inside or not. There are several sizes for wires inside of the USB cable, but I don't think that the difference would be a problem. It is also difficult to determine the exact size of wires when purchasing the cable, but if you're uncertain, go for thicker cable.

I replaced USB cables on several joysticks and mice and haven't had any major problems. I've heard that (but I've never seen any) some cables do have non-standard color schemes, so it would be best to confirm connections with a multimeter on continuity testing if you have one. Just cut the existing cable in half (but confirm first that it's the cable!) and see which pins on the connector go to which wires.

Also, be careful with ferrite beads which you may find inside the cable. It is important to have exact number of turns of wire going through them, so that they work properly. Also, make sure that you pay attention to problems which can be caused by cable tension. It's a good idea to somehow secure the cable on the inside of the device so when the cable is pulled, the solder joints aren't stressed. I've seen some people tie the cable into a knot inside the device's case, so that the knot is pulled. I don't think it will have major impact on the signal strength, if the cable isn't very long.

Here's my question on electronics.se about a similar problem. There, I was trying to repair existing USB cable with damaged connector, but some advice I was given could help here too.

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The main issue I have is being able to be flexible. Most extension cables are very stiff. I had managed to use an inflexible one by removing the thick plastic cover (which surrounds the internal little wires) but it was a bit messy. Also, I noticed the end of the mouse cable has a thick 'enclosure' (a bigger cylindrical part right before the end) but I don't know what it is and if it's required. I should probably make a question for it. – leladax Jan 17 '11 at 9:51
@leladax Well, as for flexibility, I really don't know what to say. You could try getting a thin cable, like USB A to micro USB A or B and then installing it, they are usually very thin. As for the cylinder, can you post a picture of it? It's most likely a ferrite bead (just do an image search on say Google, you'll get tons of results) and is there to suppress electromagnetic interference. You probably should look for a cable with it, but I don't think that there would be any serious problems if you get one without it. In the worst case, you can disassemble it and use it on the new cable. – AndrejaKo Jan 17 '11 at 10:28
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