|
The Moonlite has a piece of white plastic like material that sits in a channel underneath the focusing spindle. It is longer than the distance between the two grub screws. On one of my Moonlites, there are only two grub screws that are used to apply drag pressure to the spindle against the drawtube. I notice on other of my moonlites, there is an additional knurled knobbetween the two grub screws. This knob to which you refer applies a further adjustable pressure to the spindle against the drawtube.
In effect, you can apply a little more even pressure via the grub screws to increase the drag if need be. Brian
|