Introduction
If the back cover of the Pentax PZ-10 won't lock in place, the spring that holds the door in place may need to be replaced.
Tools
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            With the lens face up and the bottom panel of the camera facing you, remove the two 7mm screws on the left using the J0 screwdriver. 
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            Remove the six 4.3mm screws in the middle and right of the panel using the J0 screwdriver. 
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            Pull off the bottom casing to remove. 
 
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            With the screws removed, the bottom casing should come off very easily by pulling on the casing. 
 
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            Once the back cover is fully removed, remove the two 4.35mm screws attaching the cover of the unlocking switch, and remove the plate. 
 
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            Locate the spring at the upper left corner of the face, and pull the rings of the spring off of the pins to remove it using plastic opening tools. 
 
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To reassemble your device, follow these instructions in reverse order.