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Ed Popko you wrote: There are quite a few Kollsman Periscope models. Did they share a common mount?

Ed
For ground use, all you need is a mounting to poke the tube into and grip it.  As far as I know, all periscopic Kollsmans have the same diameter tubes and lug positions.  Unless you’ve got a Kollsman with a really short tube, length shouldn’t be a problem either.  Gary might know more.  Power via the mounting doesn’t particularly matter.  If you need power, you can modify a supply lead to go directly from your power supply into the sextant.  If you’re not interested in heading checks, or searching using azimuth, you don’t even need power in daytime with the wind-up bubble models, only with the pendulous reference models.     

To be honest, if you don’t want to pretend you’re in an aeroplane, you don’t even need a mounting.  You only need a convenient flat window ledge and a pack of playing cards to act as shims.  As ‘the Astrovan’ is currently full of junk, I’m finding I use my south facing window ledge more often these days.  I don’t even have to go outside.  DaveP