Q-drop 128 – What is a keystone?
Q-drop 133 – What is the keystone?
Q-drop 140 – What is the keystone? (twice)
Q-drop 167 - what is the keystone?
Q-drop 251 – Find the Keystone.
Q-drop 262 – Find the Keystone.
Q-drop 270 – Apply the Keystone. (Paint the picture.)
Q-drop 2633 – You have the Keystone.👇👇
