The Aziak Equipment Arca Lever Clamp can replace the existing arca base plate on any Aziak Equipment ball head. Rather than a twist lock it is a cam over lever lock, with adjustable tension via the included 3mm hex key. InstallationMount ball head clamp on current ball head into vise to hold it securely. Use tight fitting 4mm hex key (Included with your tripod when purchased) in flat head bolt attaching arca clamp to ball. Optional, but recommended - apply heat to this flat head screw as it is thread locked in place. Heat will significantly reduce chance of stripping bolt head and require less torque to remove. Unthread flat head bolt and remove existing arca base plate from head. Reverse above directions to install arca lever lock base plate, apply fresh thread locker to flat head bolt.