The Tevo Tarantula 3D printer is coming together. So far I have only mixed up two support beams and stripped the treads on one stepper motor. Luckily, switching the beams around did not involve replacing a belt. And I was able to use longer M3 bolts to reach the stepper motor's bottom threads that were still intact. (Thank you Jerry's Hardware!) Now I need ferrules and fork wire terminals and, as far as I know, there is no store in RI that sells these!
Update, 2018-11-27: Jerry's and West Marine both sell fork terminals.