Rod Stewart posted:...One other thing, can you retrofit the pot and LED to an original release PCB, or the PCB's different?
As I understand it, GRJ is designing a different PCB. The new PCB adds space for a pot to adjust the "timing" rather that iteratively inserting different fixed-value resistor to "tune" the timing. If you have an original PCB, I suppose you could mount the pot somewhere on the board and tack-in some short wires to add adjustment capability.
But if you have a working unit right now that blinks in the specified window, you should never need to re-tune it.