The M65 x 1 adapter for the Prima Luce Lab ARCO 3" robotic rotator allows you to connect the rotator to focusers or correctors that have a M65 x 1 female thread. The ARCO 3" can then be controlled via the SESTO SENSO 2 installed on the focuser.
It has an optical thickness of 3.5mm, so adding this adapter will increase the thickness of the ARCO 3" from 23mm to 26.5mm.