If you are interested in metalworking I highly recommend this metal heat shrink tubing and stretcher. I don't have much experience with metal, so I've mastered the basics after watching a lot of YouTube videos. If you need to make window channels, doors. You can craft containers to bypass the door frame, outlines, etc. I managed to make a transcap for my Jeep Wrangler YJ. These tools also have a place to attach them to the bench, making them much easier to use. If you're a metal worker or your hobby is automotive like mine, tools are essential tools. Not related to shrinking/stretching, but I also suggest buying Nutsert/Nut rivets. This allows tapped holes. After I did the transmission cover I used a nut tool so I could tighten the cover and remove it if needed.