Homer uses both terms, either in the book, on a tape or other from other writing.
The Golfing Machine ONLY speaks in precision. Homer said, “Precision is recognizing and reconciling minute differentiations.” Nothing in golf speaks of precise motions like TGM.
Gyroscope is mentioned in the glossary of terms. Homer used the term when he described the right shoulder action in Bobby Clampett’s Downswing.
Blast off is a perpendicular action off a plane. Rockets off a horizontal plane and a swimmer blasts off a angled plane. A punch can blast off a vertical shoulder. Homer writes of a “Downstroke blast off from The Top.” in 2-N–0, which may or may not be we are talking about exactly.
Homer uses the phrase in his Notes. ‘Notes from Homer’ #18- Let the left arm BLAST off the chest after it moves on your chest in the back Swing.
Btw, we know it is the right shoulder that blasts off the left arm- not a pull. See Yoda’s archived posts:
"...the Right Shoulder Turn Thrust ‘cranks the Gyroscope’ by blasting the Left Arm off the chest."
This blast off, I believe, is never fully achieved as the pivot keeps contact with the left arm throughout the stroke. This is why ECox can discribe two blast off motions.
I have never known Lynn to substitute or create words that were not first used by Homer Kelley. He is funny that way. LOL