CLA = clean, lubricate, adjust. At one time a CLA was regular maintenance, performed at regular intervals to ensure the continued functioning of the camera. A working pro might have a camera given a CLA once a year, perhaps twice a year if in "severe service". These days, most cameras in the 40+ year old category need a complete overhaul, not a simple CLA.
In order:
The camera is opened, meaning the top and bottom covers are removed. any dirt or dust is removed, (keeping the film chamber clean is the responsibility of the user), any dry lubrication points are taken care of, and all functions are checked - rangefinder if an RF camera, meter if present, shutter speeds, mirror function if an SLR, and any other functions that particular camera may have. Adjustments are performed if through normal use and wear some of the function have drifted outside spec.
You lubricate what needs to be lubricated with the appropriate lubricant, you know what to use and where because you a) looked it up in the service manual, or b) have sufficient knowledge and experience to determine this without the service manual.
You adjust what your inspection and testing indicate in need need of adjustment, said specs to be found in the service info. If no service literature is available, you rely on what is known as "good practice" and experience.
A complete overhaul is a complete teardown, cleaning all traces of old lubricants, repair of any faults, repair/replace any worn parts, and reassembly/relubrication. Not for an amateur, a Nikon F2 has about 1500 parts. With modern lubricants, an overhaul will assure as-new function for 20 or more years under normal occasional use, that is assuming the camera is not used as a busy working pro would have used it in say 1980 and that reasonable care is taken to keep the camera clean and away from high temperatures.
There's a camera I'm not worried about ruining. But I did have an Argus C4 that was hopeless.I have done a CLA on my Argus C3 twice -- not bad since I bought it new about sixty years ago! I might be less quick to dive into some of my other gear.
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