This is probably the hardest part of the disassembly, certainly the least intuitive. The end caps hold the whole unit together and are just popped in. Gently pry them off pulling them by hand, rotating as much as you can, and then using a small flat-headed screwdriver to pry them off. This will take a little pressure and work.

The caps are held on at the centre (see the middle of caps in the photo). This is where you want to focus the pressure when prying. Be careful of plastic clips but apply assertive pressure to pop them off.