To use the SkyWatcher 6x30 and 9x50 telescopes on a telescope tube, you need a slipper: by screwing these slippers onto the tube, you can insert and remove the telescopes in the telescope holder in one easy movement.
The distance between the holes of the fixing screws is 21 mm. The slipper has a 1/4" thread in the middle. Fixing screws and nuts are not included.