Watch back opener for Seiko SNK809

thingiverse

A tool designed specifically for opening the threaded back cover of Seiko SNK809 watches is available, although some users have reported that it can be quite tight-fitting, necessitating additional work with a knife or chisel to ensure a smooth fit. By firmly pressing the tool into place, damage to the watch's plastic casing should be avoided, and the added leverage provided by the 6 mm hex key slot in the back of the tool can help to loosen any stubborn parts. However, users are advised to exercise caution when attempting to remove the watch back with a tool, as it may become stuck due to its own weight or other factors, requiring the use of through holes and additional force to dislodge it completely.\r\n\r\nCaution should also be exercised if the user has an original cloth strap or steel bracelet still attached to the watch, as this may interfere with the tool's operation. Removing any additional accessories before attempting to open the back cover is recommended, although some users have reportedly successfully completed the task while wearing a NATO strap.