A - This thumbscrew doesn't seem to tighten anything.
B - This scale can be rotated independently by hand.
C - This scale can also be rotated by hand.
D - This ring with the indicator can be rotated independently.
E - 3 grub screws hold the telescope in. If you loosen them the polarscope comes out.
F - 3 setscrews with pointy ends dig into the threads holding the illuminated reticle to the long polarscope tube.
G - The eyepiece screws in or out to focus.
Which screws align the polarscope? Which control the rotation? Should all those scales be loose to move freely? What's that thumbscrew do?
I thought I generally knew what a polarscope should do, but I don't get this at all. If E and F are tight, the polarscope won't rotate.