|00:42Banjo rims are usually built by one of two methods. Laminated rims use wooden plys up to 1/8th" in thickness. Block constructed rims use blocks that are cut to fit together to make a circle of wood that is slightly larger than the final rim will be. Several such hoops are stacked and glued together and the final rim is cut from this oversize rim on a lathe. The joints are aligned so that they overlap for strength. there are many variations of this, lapjointing the blocks, keying the blocks. These are attempts to increase the strength of the final product. This method is also sometimes called Pie Wedge Construction.