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Troubleshooting MasterLock Coupler Lock Where Key Seems Stuck


Having problem key won’t turn to


Expert Reply:

Try shooting some WD40 with a straw into the key slot of the Master Lock Trailer Coupler Lock # ML389DAT to see if you can get it to free up stuck tumblers. Most likely that will fix the issue but if not let me know!

expert reply by:
Jameson C

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