A catalyst and method for improving combustion efficiency in boilers, engines, and other equipment by adding to fossil and other fuels a fuel additive that contains an oil-soluble iron compound and an over-based magnesium compound and for which the median particle size of the additive is less than about 0. A method for protecting multiple cable plugs from damage, including steps for inserting a plurality of cable plugs into a housing containing multiple cable jacks arranged side-by-side, orienting said housing such that it is perpendicular to, and attached to, a single cable plug adapter, and electrically connecting said cable jacks to said cable plug adapter. The imaging sensor base has a bonded hub having uniform flatness. The remaining of the cache ways do not receive the enabling signal. The bottom end of the umbrella pole can be removably inserted into either of the respective tubular members.