Ouch!
> Seriously, I check it all the time. All you have to do is check the
> collimation with the focuser racked all the way in and all the way out.
>I have
> never seen my focuser move by itself, but it gives me a warm feeling to check
> it everytime anyways. Of course when building a scope, you must check this
> very carefully.
>
How does racking the focuser in/out catch focuser misalignment? Racking the focuser in/out does not change it's alignment - unless you have a really bad focuser.
I must be missing something here.
Bob L