The brass parts were made by me, but they could easily be replaced by automotive-type electrical connectors purchased at any auto parts store...
Bicycle parts stores also have great gadgets like barrel adjusters and inexpensive cables...sometimes I just take pieces off junk bikes...
Pic is an adjustable throttle kit for a Honda GC engine using electrical connectors and bicycle brake parts...just as an idea for things that work well as throttle linkage...
Nebraska...the good life.