Thank you for the video, I have already seen it before though, personally I would like to get them pre-hacked to save the hassle of getting the separate parts.

But if need be I'll hack them myself. Problem I found is that there is a site which sells the steel gears needed, but I'm not so sure about the number teeth the gears have, is it 15 or 18? The grub screws should be easy enough to find.

Thank you for the advice on the sabretooth, I think I will get those 30A ones since I don't want to be spending about £100 and blowing my budget on the 85A ones. or blowing £50 on a dud.

Thank you for the help, once I get these parts together I can begin to focus on the design.