A Few Helpful Links:
These are some helpfule sites that I've collected, that you might find useful as well.
http://www.fitnessforums.net - Professionals from around the industry come to this message board to ask and answer questions.
http://www.fitnessrepairparts.com - Amazingly well organized and large database of parts for tons of different equipment. If you need a part for fitness equipment, this is where to find it!
http://www.precor.com - One of the best manufacturers of fitness equipment.
http://www.truefitness.com - Another of my favorites in the residential equipment area.