Although there are no officially sanctioned repair kits there are third party kits available for sale online and replacement parts for repairs.
Fine thread repair kits may be purchased from a retailer in the car repair business. Alternatively there are fine thread repair kits available on Amazon or Newegg for approximately $30.
They do offer a rotted wood repair kit.
There are kits available that will repair scratched lenses on cameras and glasses.
There appear to be a number of places where one can get a broken iPod repaired. There are sites such as "icracked" that offers on demand repair, mail in repair or do it yourself repair kits. There is also a company called Digi Express that does repair for iPods and more information can be found on their site.
Kits for automobiles are available, kits for window air conditioners are not. You will need to take it to a repair shop or replace it.
Consult with the screens manufacturer. They usually have repair kits available for just such a purpose.
Best Buy doesn't sell Nintendo Ds repair kits they do sell Nintendo Ds accessory kits and cleaning kits.
There are windshield repair kits available to fix this your self. How ever if you do not feel comfortable doing this your self you can find a company who will do it for you and provide a lifetime warrenty on the repair.
A sushi kit or the brand Blind Brite is good
Thread repair kits are available from your local auto parts store. They come with directions.
There are repair pieces and kits available from The Fiero store. There are also repair kits for specific problems (bushings etc) available from several sellers on E bay Basically remove Assembly from car, remove motor from assembly, drill out rivets, replace faulty parts, bolt back together with supplied bolts and nuts.