Hello, This is my first attempt to use openbuilds parts to build a rotocasting machine. I have a list of most of the parts I need but can't find a way to properly attach and fix a 5mm shaft to a v-slot perpendicularly. I've attached an image and a link to a youtube video of what I want to replicate. I made a question to the uploader of the video but he hasn't answered. What I need help with is, I'm trying to figure out if there is a part (and its name) such as the black one attached to the side of the frame or maybe it is 3d printed. I don't have a 3d printer so I may end up modeling one from wood or resin which is fine with me, but want to give it a go and try to buy the parts if they exist. Cheers! . .