Gonna have to disagree with you sir. 
  
I've had mine off for over a year. 
  
You do need to mark for original start point and make sure it dose not get away from you when the set screw is loosened. 
  
I personally kept having sputtering issues and left it off to get her tuned out correctly, never putting it back on. 
  
Now I'm at the point if I put it back on, (been running fantastic for 6mos?), Murphy will bite me. 
  
Anyhow, this 25yr plus device is problematic, and down right junk,,,,comparatively.