Parts: Miscellaneous (July 2020)

Pololu electronic parts including elecrtonic switches and voltage converters

MicronRC radio control parts including Deltang receivers

HomeFly radio control parts

Walthers is probably the largest supplier of model railroad items

Tower Hobbies sells radio control items and model railroad items

Northwest Short Line makes gears and gearboxes that look like jewelry (to me anyway). Also washers, screws, and other tiny hardware.

McMaster has all kinds of hardware including metric

For the hardcore, Koichi Tanaka makes the tiniest RC and IR gear I have ever seen. Unless your Japanese is better than mine you might want to try this search term *indoor airplane world e-shop* and let Google translate the web site. Tanaka-san is a great guy and is very helpful.