Help collimating a "classic" Tasco 11T-R 4.5" reflecting telescope

(i pulled this out of another thread as buried my real question in an
inappropriate thread)

Now, im posting a link of the back of the telescope.

http://home.maine.rr.com/benno/Image-08.jpg

you can see the 3 thumbscrews and 3 phillips head screws. since im
without a manual for this thing, how is it that i adjust the mirror
with these? do i loosen the thumbscrews and do fine adjustments with a
screwdriver to the phillips screw, or vice versa?


I'd like to take the whole darn thing off as a unit to clean it. Now,
heres another point in my confusion. how to get the back off. Not
shown in the pic are three small screws that screw through the red
tube into the back. to me, these look like they hold the back on, but
when i take them off, and tug on the back,nothing gives. granted i
could tug harder, but am reluctant to do so without all the facts.