well.....since you don't want to fix it right, you could try this: 1.
insult the customer. try a smart-ass answer to any questions he might
have. 2. Add any refrigerant that you want to, because on a system that
old, anything other than R-12 is probably going to put too much stress
on all parts of the system, leading to failure soon. 3. Insist on cash
payment, after all you wouldn't want to have to pay taxes on that 4.
Wish him a nice day, and give him some literature about the LDS church.
5. In about six months, wonder why he hasn't called you back out.