I took a few pics so beginners can see how these focusers work and how easy they are to adjust. These cheap focusers work ok providing they're properly adjusted, and if the focuser isn't wobbly when new it probably will be after some use.
The focuser tube rides on two teflon strips at the 4 o'clock & 8 o'clock positions; slight pressure is applied at the 12 o'clock position via two hex head grub screws on top of the focuser. I adjust mine so there's just enough pressure to stop any wobble in the focuser tube.
