Hyphenation - "Double-Spaced"

One of my more challenging grammatical puzzles - hyphenation. Today, I researched "double-spaced", and found this, from http://www.proofreadnow.com/blog/bid/29485/Grammar-Usage-Compound-Verbs


If the infinitive form of a compound verb has a hyphen, retain the hyphen in other forms of the verb.

• Would you like to air-condition your entire home?
• The theater was not air-conditioned.
• We need an air-conditioning expert.
• You need to double-space all these reports.
• That material should not be double-spaced.
• BUT: Leave a double space between paragraphs. (No hyphen in double space as a compound noun.)

The gerund derived from a hyphenated compound verb requires no hyphen unless it is followed by an object.

• Dry cleaning is the way to clean this blanket.
• BUT: Dry-cleaning this sweater will not remove the spot.
• Double spacing would make this table easy to read.
• BUT: Double-spacing this table would make it easy to read.
• Spot checking is all we can do.
• BUT: In spot-checking the data, I found some embarrassing errors.