Concenter collimation tool for reflecting telescopes

Use this tool as the first step, to make sure that the secondary mirror is properly positioned and centered relative to the focuser tube.
It is designed for a 2 inch focuser tube. make sure that the secondary mirror is properly positioned along the Z axis as viewed through the focuser. Also check that the view of the secondary mirror is round as viewed through the focuser, as you rotate the secondary mirror along the Z axis. Also, check that the secondary mirror disk is accurately centered under the focuser.
Do this as the first step, before adjusting the 3 screws adjusting the secondary mirror to the spider assembly.
No supports required to print.