Hex Head Nuts & Bolts The Renova kit supplies some hex bolts but gluing them to card then cutting them out individually seemed a time consuming chore. So, I made my own. In the following photo you can see the brass syringe I made from telescoping hexagonal tubing available in five consecutive sizes from Small Parts Inc. Check them out on the web. I soldered sections together and extruded Celluclay in long sections. Once dry, I gave a section a smoothing swipe with a jeweler’s file, then sealed it with CA. Of course, I have this syringe for other applications and enough brass tube to make any of five diameters. Pretty cool, huh?