Yep an adjustable lens cell and a name change is pretty much it. Some of the CR150's had the adjustable cell towards the end of the production run prior to the name change. The Yard Cannon was a CR150 with an adjustable cell.
-------------------- Scott (Kilt Boy)
"The only thing necessary for the triumph of evil is for good men to do nothing." -- Edmund Burke.
"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf." -- George Orwell
"The measure of a man’s greatness is not determined by what he accomplishes for himself, but by what he accomplishes for others.” -- Some Bald Guy