How to open a Shimano SIS shifter?
My newly purchased used bike has Shimano SIS shifters. The left one has a sticker saying "Light Action", and they have model number SL-RS30 printed on the bottom side.
I need to open them, because they do not work, but I can't find out to get them opened. There is one screw on the bottom of each, and when that is loosened, the shifter can be slided off the steer bar. But I cannot open the shifter box itself.
Does anyone know a magic trick on how to open the shifter box? (and yes, I tried "Open Sesame!" but it still wouldn't open)
Here are two pictures of the shifters, the last one including my left foot (taken with my phone, so sorry about the quality --of the pictures, not my foot):