reliability (they know when you are going to come by and can count on it), quality repairs, and a willingness to help them out if necessary(for dealers that could mean you would repair one of their customers cars at the customers home if necessary or make a special trip to the dealership to repair a windshield if the need it done before your regular day visiting them)
It's been my experience their are a lot of people doing this who are unreliable, and dealers really appreciate it if they can count on you.
Also remain persistent, you may have to call on a dealer a few times before he will use your service.

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