Why are Wrights in the RN called shiner?

In the Royal Navy, the term "shiner" refers to a Wright, which is a slang term for an aircraft engineer or technician. The nickname likely originates from the shiny surfaces of the tools and machinery they work with, as well as the polished appearance of the aircraft they maintain. Additionally, "shiner" could also allude to the bright, reflective qualities of the aircraft's metal components. This term is part of the unique vernacular developed within the naval community.