Spencer Lewis says that an understanding of the pivot point on a miter saw and the use of a two-piece stop block makes cutting trim faster and more accurate. What's a pivot point, and why is it important, you ask? As Lewis explains in this recent Insider Carpentry Youtube video, when you change the cutting angle of a saw from a 90-degree crosscut to an angled cut - such as for a 45-degree miter cut - the blade actually rotates around the saw's pivot point so that both crosscuts and angled cuts made from the same side of the blade - typically the right hand side - will be the same length, as measured against a stop block positioned on the fence. Because the pivot point is determined by the intersection where the planes of the fence and (in most cases) the right-hand side of the blade meet, crosscuts and angled cuts made on the left-hand side of the blade won't be the same length. When trimming a room with many repeat cuts, understanding how this works will allow you to make accurate production-style repeat cuts in batches while avoiding a lot of repeat measuring.