Here’s the repair manual for your meter [https://vdocuments.mx/pentax-spotmeter-1-21-repair-manual.html|PENTAX SPOTMETER 1-21 REPAIR MANUAL]
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Here’s the repair manual for your meter [https://docs.google.com/document/d/1Vexupo7IY6x9BreN6mByCkDt-Gvrc550gnDw12GLAGs/edit|Pentax Spotmeter V service manual]