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Old 12th Jun 2021, 6:35 am   #14
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 18,167
Default Re: Hickok 539b bias gauge

Some meters were made with their mechanical zero adjuster working on the rear spring reference position, having a screwdriver slot at the rear of the case. Have you checked under any label on the rear?

Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
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