Pantyhose. That's what was best for me and my car back when I was a comedian. Are you doing what's best for your customers or just giving them what they want?
I had a mechanic I always went to when I was a comedian (throughout the 90's) for reasons like this:
One day I went to grab my car after he had replaced the brakes. He tossed me a couple pairs of rolled up pantyhose. "Here, my wife tossed these out. Take 'em."
Of course, I was perplexed. He quickly showed me, though, how to wrap the pantyhose in place to replace any broken belts. In this manner, when I was, say, in the middle of New Mexico, 200 miles from anything (no cells back then), and a belt broke, I could use pantyhose (they stretch then retract back into place) as a temporary belt that would get me a few hundred miles down the road.
Do you do this for your customers or do you simply give them what they want and pay for? Incidentally, I used the pantyhose twice in my ten years as a comedian--lifesavers both times!
He got tons of business from me and my referrals. And it took him all of 45 secs to grab the pantyhose, toss them to me, and explain how to use them. In fact, he asked me to stop referring people because his book became so full.
Don't forget the pantyhose. That is true customer service.