Today I set it up to test whether the polarscope was properly aligned, and if not, I've to adjust it during day time.
I look through the polarscope to distant objects and found that it's matte.
I pointed the polarscope to the corner of a building and then I begin to rotate the RA axis. It's very smooth and it's a joy to turn it. Obviously, the polarscope is still in great alignment with its axis, there's no obvious moment.
This is workmanship!