Well, it's a long story but I can't fit a 1N4001 diode on the board. However, if I need to, I can fit an SMT SOT-23 diode on the board for this purpose. I have some units in service now and my main reason for asking was to know if I should expect problems later on. Like I said, I can't add a thru-hole diode but I can add an SMT verision. It's 500ma SOT-23.