A hub assembly and methods of attaching the same to a catheter shaft. The apparatus includes lower and upper frame assemblies each including spaced upright tubular supports, the lower frame assembly supports attachable at a lower end thereof to the deck. Within the second inverter, one transistor is coupled to the second output of the previous dual path inverter, while another transistor is coupled to the previous dual path inverter’s first output. The contact layer has a thickness that is less than a critical thickness. It may then be determined that a second erase counter associated with a second zip code is low relative to at least one other erase counter, and based on this determination, data from blocks in the second zip code may be written to new blocks as part of a wear-leveling operation.