Manually tighten the concave (set) screw.
Use a hex key (Allen wrench) or other general tightening tool to tighten.
Then tighten the convex (lock) screw manually. Make sure that there is a gap of about one pitch between the concave and convex screws before tightening.
Tighten the convex (lock) screw with a general tightening tool to the specified torque or one turn (360 degrees).
The installation is now complete.