A disk drive includes a rotary actuator including a pivot bearing cartridge. The pivot bearing cartridge has a pivot shaft with a shaft body and a shaft threaded end. A disk drive base includes inner and outer sides. The disk drive base includes an actuator support section that has a seal portion including a seal attachment surface disposed along the outer side. The actuator support section includes a raised portion extending from the seal portion towards the inner side. The actuator support section includes a hole portion positioned laterally within the raised portion and extending through the raised portion towards the outer side. The hole portion is engaged with the shaft threaded end. The hole portion includes a distal end that does not extend beyond the seal attachment surface. A seal is disposed upon the attachment surface for sealing the pivot shaft within the disk drive base.