Introduction
Overtime velcro on the strap will become worn out which can cause the HMX-F90 to become difficult to hold. This guide can be used to replace the worn out hand strap.
Tools
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            Pull the release tab away from the battery. 
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            Slide the battery towards the release tab and then pull the battery away from the camcorder. 
 
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            Rotate the camcorder so that the strap side is facing you. 
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            Locate and remove the three 4.5mm Phillips #00 screws around the hand strap. 
 
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            Rotate the camcorder so that the battery slot is facing you. 
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            Located in the top left corner of the battery slot, remove the 4.5mm Phillips #00 screw. 
 
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            Rotate the camcorder so you are looking at the bottom of the camcorder. 
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            Locate and remove the last three 4.5mm Phillips #00 screws. 
 
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            Unfasten the strap from the outside. 
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            Pull apart the velcro on the faux leather strap sheath to reveal the separate end of the strap. 
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            The loose end can be pulled off the velcro and fed through the loop on the casing to free one end of the strap. 
 
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            On the inside of the opened case, locate the silver metal plate and remove the 3mm Phillips screw. 
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            Feed the strap through the hole to remove completely so that it can be replaced or cleaned. 
 
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To reassemble your device, follow these instructions in reverse order.