Alternatives to paying for lens focus calibration?

[Black_Dog]

This video shows how to make micro focus adjustments to an EF-S 17-55mm f/2.8 USM (in addition to how to seal dust out of the lens). This lens uses internal focusing, not a rotating front element. I would never put silicone on my lens like this, but it is a good look at the mechanicals of the front of a Canon lens and how the focus calibration works.

Here is another video that shows how to calibrate the focus of an EF 50mm f/1.8 by soldering the focus control board. This is a completely different methodology. Neither may work for bitwise's 24L.