I was given a beautiful nickel-plated antique phonograph reproducer arm (with mica diaphragm) from a friend many years ago. I found an old lamp base to mount it onto and inserted a contact mic inside to amplify the reproducer's sound. In place of the steel needle I tried various needles and pins and settled onto a spring recovered from a broken laser printer and antique seamstress' pin which had the perfect amount of tension, length and vibrational qualities when either scraping the end against rotating objects or skirling along its length.
I built a "turntable" out of a child's rotating motor-thing, gave it some potentiometer speed control, and mounted a metallic concave "record" which formerly spent its life as the base of a rice cooker.
When brought together, The Phonographer and Rice Turntable make outrageous cacophonic scrapey sounds, less like repetitious chalkboard nails as otherworldly looping grinding machine failures, again and again and again, with a similar effect to ones teeth.
Alternately, when sliding the length of the amplified pin across the edge of metallic cylinders (such as a perforated chrome Ikea pencil & pen holder on a mirrored rotating display turntable) much more soothing staccato sine waves of sliding slow metallic oscillations and AMSR grunchy popping resonances emanate from between the metallic surfaces.