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Dennis, fortunately all my scopes use centre positive power inputs. If I had one mount or scope that uses opposite polarity power input, I would build small adaptor that plugs into mount and have a socked for power input. Inside would be diode in series between power in and power to the mount. That way plugging wrong plug to it would not result in any damage, it just would not work. I would find the way to make this adaptor permanently attached to the mount. Knowing myself I’m sure that sooner or later I would plug wrong power plug to such a mount regardless if marked or not.
There would be about 0.6V voltage drop across the diode and if used with battery it would shorten time it can be used, before battery appeared to be discharged..
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