Shimano M520 Disassembling Helper
thingiverse
I think if you know what is shimano m520 and want to disassemble it. You know what this thing is :-) To disassemble pedal (and assemble in later) there is a tool needed. But I have not own one. So I make this substitute. Not ideal but does the job right. Just need 24mm wrech. You can freely do what you want with source files and .stl ... Good luck!
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