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reply to omnivorr.....
Hi again omnivorr - removing or dispensing the ability to rotate the dob base of your scope (ie the azimuth motion) and taking into account all your other steps (which is how I first postulated this subject in my first post that started this thread) and sitting it on an EQ platform will prevent you from looking at any objects that are not on the meridian line you have set by where you've plonked the mount on the EQ platform. That is, you will only be able to move the scope along the north south line parallel with the scope's light-path axis (as you refer to it) directly above this scope-tube position.
This is because an EQ platform is fixed to the ground and cannot rotate, it only describes the apparent path of an object's motion for a limited arc-movement (approx 1 hour usually.)
Keeping the mounts ability to revolve in the horizontal plane as well as the vertical allows you to point at almost anything in the sky before you then activate the EQ platform's tracking drive. Otherwise you'd have to physically drag the proposed fixed/static baseboard of your "crippled" dob mount around on the fixed platform/base of the EQ platform to sight up objects not on the meridian you've plonked it on! Analogue setting circles will function as a rough setting fix/go to with the unfettered dob mount on an EQ platform.
Hope this makes sense to you, regards, Darryl.
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