Apple II Maintenance: 3.5" Drive Overhaulhttp://www.apple2.org : The Apple ][ 
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Reference Pages: Apple II Hardware [ 3.5" Disk Drive Tuneup ]
      Manufacturer: Apple Computer
      Head Assembly Removal and Handling
       Once the datacables and screws are removed you remove the head assembly 
      by lifting it on the side that has the bar. The other side has a small 
      shaft that sticks out and sits in the groove on the worm gear (corkscrew 
      shaft). This is the first place you want to clean. Remove any build up 
      that is on the shaft and brass support below from the head assembly. SEE 
      BELOW FOR PROPER HEAD ASSEMBLY HANDLING.
       The Head Assembly should only be handled from the rear as shown in these 
      two pictures. DO NOT separate the head by hand. You will more than likely 
      damage it. The brass colored thin metal sheet that holds the top head to 
      the back is actually spring tensioned and is what holds the head onto the 
      surface of the disk to read/write. Without the pressure it will not work. 
        This is the reason you do not not want to move this. In this side view 
      you see the head assembly being held from the rear, this is the only way 
      you should hold it. You have been warned. After cleaning the shaft/brass 
      support off place the head asside. 

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