Canon 50 f/1.5 - disassembly tips?

I have a cleaning note for 1.8. The lens may be similar in mechanical construction. If you want it, give me your email, I will send it. It's too large for posting ( I just don't know how to shink the file).
 
It's pretty straight forward:

Start from the back, take the focus helical off (with a lens spanner).
Then you can take the rear element block out to get access to the aperture.

Roland.
 
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