Check out the awesome linkage we designed for our upcoming GBC 49 Geneva Drive – 42120 Alternate Build. 5 beams work perfectly together just to get that specific angle and movement. It took us some serious time to get it all working exactly as we wanted it to. We needed a specific angle, had a fixed input driving point and we could only use the parts of the existing LEGO set. Challenging but we succeeded. Read more on our upcoming GBC on the product page.