A ratcheting, locking actuator for selectively positioning ergonomic devices is disclosed. A suitable feedstock for forming a diesel boiling range product can be hydrotreated to have a sulfur content of at least about 100 wppm and then dewaxed. The extension shaft member may include a smooth portion, and the extension shaft member may cooperate with a collar member. The ring-shaped sensing structure comprises an outer section and an inner core. Any variance in density of product in the package can be accommodated by the stiff, yet flexible, sides of the package.