For sale is a SONY Walkman WM-109. It's rare to find these in working condition. I was able to acquire one in very good condition and have had it overhauled, so I'd like to offer it for sale. It uses an aluminum body, and I feel it inherits the DNA of the WM-501. It's about the same size as a cassette tape case. According to online information, it seems to be the culmination of the next generation of product development, focusing on how to make things smaller. The mechanism of this product is well-designed, miniaturizing the mechanism structure of a radio cassette player and fitting it into this small chassis. The following overhauls were performed on this unit: * Removal, cleaning, and removal of stuck parts of each gear, and greasing (high-performance grease with PTFE particle blending) * Capstan shaft polishing (using Piccard) * New replacement of drive rubber belt The rubber belt has been replaced with a new one. * New replacement of pinch roller The pinch roller has been replaced with a new one. * Motor overhaul Due to aging, the drive motor can experience increased friction in the internal rotating system, leading to a weakening of the motor's power or the generation of unusual noises. Therefore, the drive motor was disassembled, overhauled, and lubricated with high-performance oil for the rotating system. The rotation has been improved to be incredibly quiet and smooth. Tape running speed adjustment Adjusted using a test tape to achieve 440Hz (A note). * Head demagnetization Head demagnetization has been performed using a head eraser. \[Notes] Dry cell batteries are not included, so please prepare them yourself.