How do you change the bank account for Series HH interest payments?

How can I change the bank account my series HH bond interest is paid into?

Tom's response

Use the Treasury's Direct Deposit Sign Up Form. The form doesn't say on it anywhere that it can be used to change the bank account your interest payments are going to, but the Treasury says it's the right form for this.

Check the Interest Payments box at the top of the form. The instructions on the form are ambiguous about whether you need to include the bonds with your request - you don't. Unlike most Savings Bond forms, you don't even have to have your signature certified by a bank.