This tutorial from Redrock Microsystems will teach you about changing lens mounts for the M2 adaptor. This tutorial is from 2006 and is thus rather dated. But if you're still using the M2, this info will be essential.
Want to master Microsoft Excel and take your work-from-home job prospects to the next level? Jump-start your career with our Premium A-to-Z Microsoft Excel Training Bundle from the new Gadget Hacks Shop and get lifetime access to more than 40 hours of Basic to Advanced instruction on functions, formula, tools, and more.