How do you disassemble canon FD lens?

To disassemble a Canon FD lens, first ensure you have the necessary tools, such as a small screwdriver and a spanner wrench. Carefully remove the retaining ring at the front of the lens using the spanner wrench, then unscrew the front element group. Next, remove any additional screws or retaining rings to access the internal components. Take care to document the disassembly process to aid in reassembly.