21. 22 . 23. Every party who signs a negotiable instrument is potentially liable for payment of that instrument when it comes due. Timely notice of the dishonor of an instrument that has been properly presented for payment discharges the liability of parties who are secondarily liable on the instrument. It is not a material alteration to change the figures on a check so that they agree with the written amount, and thus, any holder is entitled to enforce the check. The lack or failure of consideration is a personal defense and can be used to avoid payment to an ordinary holder, an HDC, and a holder through an HDC. A third party who buys a note arising from a consumer credit transaction that lacks the notice required by FTC Rule 433 is still subject to the buyer's defenses against the seller because of the otherwise harsh effect of the HDC doctrine, 24. 25