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These drives were available in several configurations.
Operating and Service manuals at bitsavers.
RK8E - OMNIBUS Controller for RK05 drives (3 quad-high OMNIBUS cards)
RK05J - 02-23337 - Foam and battery replacement
RK05J - WF-24746 - Foam replacement
RK05F - Rosen - ersatz elbow
Notes:
Head locking bracket hold-down - 5/32“ hex
Fan hold-down bolts - 3/16” hex
Fan foam ring - 1/2 wide x 9/16 thick“
Cartridge nozzle foam - 3/8”
Emergency retraction battery - AA1800mAH NiMH 4.8V