Trash inside my monocular

The previoust reply of How to clean is very good.  However, it does not answer your question of how to disassemble it.  It's pretty easy to take apart and get back together again.  Removing all the dust is always a challenge outside a lab.

To access:  Hold the body/front lens with one hand and unscrew the knurled ring toward the back/eyepiece end with the other.  It shouldn't be very tight, as the main tube is plastic.  Hopefully this is where the dust is.  From here, you can clean the inside of the largest (objective) lens, and one side of the "second" lens.  (This is the lens you can see through the objective lens).  Due to design, this area is most susceptible to dust every time it is extended for use, as the felt shims do not fully circle the inside of the brass tubes.  There is a good quarter inch end gap for air/dust flow on each felt.
If you still have dust after assembly:
The eyepiece is threaded to a small ring that threads into the smallest brass tube, and there are two lenses inside in a plastic holder, with a spacer to hold them apart.  This may come apart as an assembly, or like mine, the eye lens will be ready to fall out. (BTW, the lenses curved surfaces face each other). When re-assembling, thread this assembly to the brass eyepiece finger tight so the eye lens doesn't rattle.  Set it aside.  Looking down the smallest brass tube, you will see a lens at the bottom.  This is the other side of the "second" lens you cleaned earlier.  When clean, thread the eyepiece assembly back into the brass tube.  
If this was performed under lab conditions, all is clean.  
Charles

Blow it out with canned air-- if the lens is dirty follow these instructions--

http://www.televue.com/engine/page.asp?ID=143