“Dear Mike,

I wish to apologize for being slow in getting back to you after your came to my — and fixed my leaking window wells. You were right! It’s worked beautifully. Use me as a reference anytime. I will enthusiastically endorse you.

I have enclosed payment for your work as agreed to, $—-…

… Thanks again Mike. I will be in touch as further developments occur.”

Sincerely,

Don”