A plurality of boards are arranged perpendicular to a base plate and parallel to each other. The rings may be axially aligned with the blade rows. A first retainer mechanism includes a first threading configured to limit a motion of the piston in the suction chamber. The second amorphized region is then etched to the second depth. The selection may provide for identifying available SAF transport servers, organizing the SAF transport servers into server groups, and selecting the optimal SAF transport server belonging to a server group where a recipient mailbox server is located.