I am training as a studio engineer and for my Major Project at university I am going to be building a microphone placement device . I am an amateur when it comes to electronics but I have a solid set of ideas when it comes to the actual build. My project will look fairly similar to the one shown in this video, however I am looking to have a extra motor to control the mic stand itself for off-axis movement.
The device construction is comfortably within my skill level (I think) but I am having trouble finding some of the parts shown in this video. I already have the motor’s, rack and rails but I am unsure on what kind of pinion is shown on the upright motor at 0:33 of this video.
I think it may be the Metal 12-Tooth Pinion listed below but would like conformation before I purchase anything.
I would also like to know if Vex sells the nuts and the square shaped rod shown in the first picture below. Secondly I would like to know if the long screws shown in the second picture are available to buy.
Thanks and appreciate any help!](http://imgur.com/zz5RrXd)