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You just put a flashlight into the side of the Cheshire while looking into it and then make adjustments to move the dark dot over either a dot or annulus marked into the centre of the main mirror.
I use a low powered flashlight that I also use for reading star charts - I replaced its incandescent bulb with one of twice the voltage. With newer LED flashlights, just put insulation tape over the light, either red or lots of white strips, to lower the amount of light going out.
It doesn't matter whether you use the Cheshire, day or night.
But if you have a truss tube dob, you pretty much have to use it every time you assemble the dob.
Regards,
Renato
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