Shown is a pallet assembly having a lid and a pallet, either or both of which can include one or more cam lock assemblies. Once the desired level of directivity is obtained, this board is locked with screws from the top. For example, if the aforementioned timing is synchronized with the blanking period of a picked-up image, a stable voltage measurement is enabled at timing at which the intrabody introduced device applies a low load. This provides an analog filter where the output comparators will not instantaneously switch between opposite duty cycle correction states. The stacking assembly also includes an anti-abrasion linkage responsive to rotation of the digital rotary positioning device to forcibly displace a surface of the stacked mailpieces away from a moving surface of the ingestion assembly.