Remix of IDKWhatToPrint's amazing adapter but for and EF mount.

Assembly instructions:

https://youtu.be/OdWRxheDb6g

I added alternative lever that uses M2x5mm (or longer cut to size) screw as a locking pin, it may scratch your lenses but is stronger and more reliable.

To secure the screw in the lever you can use some leftover plastic from supports/skirts and melt it with solder iron or you can leave it only screwed in but it might become loose because plastic there is quite thin.