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May 28, 2026 - 03:07 PM
The rubber washer is designed to create a waterproof seal in the MI-6 and MI-4 pinpointer battery compartment as supplied. The washer material provides sealing properties when properly installed between the housing and end cap. Maintaining the washer in good condition and replacing it when it shows signs of wear, cracking, or permanent compression ensures continued waterproof performance. Clean any residue from the housing threads before installing a fresh washer to ensure proper contact and sealing. Regular inspection of the washer helps identify when replacement is needed to maintain waterproof integrity.
