Motorized input rotary selectors ALPS ASD1017 / Yamaha VT148400 were used in several Pioneer, Onkyo, Yamaha vintage amplifiers. There were plastic gears that cracked during the time, including this worm gear.
Replacement worm gear was created using a precise 3D printer and durable material (nylon). The gear was tested for correct operation.
ALPS ASD1017 worm gear 
ALPS ASD1017 worm gear 
Compatible devices: Pioneer A-501R, A-502R, A-701R, A-702R, Onkyo A 8051, 8940, 9510, 9511, 9711, 9911, Yamaha AX-1070 and more.
The part is also labeled Yamaha Rotary Switch SRBA Gold VT148400 in Yamaha devices.
Compatible with ALPS ASD1016 Input Selector.
Compatible also with Sansui AU-X517R amplifier.
Available in the e-shop.
Check also complementary ALPS selector gears – ALPS ASD1017 Motorised Input Selector Gears