Baader 2″ KlickLock clamp for M84 thread for the large Pentax
refractors. Without exerting any force, operate the rotary lever of the
Click-lock mechanism and thus clamp a 2″ star diagonal, an eyepiece
or a 2″ adapter exactly on the optical axis. The click lock
Clamping distributes the pressure evenly on the housing wall and
puts less strain on the adapter or eyepiece.