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Old road shifters jammed or not shifting. Shimano Sora ST-R3300

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Here's the tutorial on how to disassemble, clean, grease and assemble the vintage Shimano Sora ST-R3300 shifters. If your shifters don't work, try to start simply by spraying some WD-40  into it. The old grease might stop the pawls from moving. If it doesn't help, the full maintenance can be necessary. I use a Shimano grease, like this one.


Here are some pictures of the Shimano Sora ST-R3300 overhaul (the two last pictures show the important moment of putting the tension on the spring, during assembly):



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