Thanks for the comments guys, appreciated.
MrRick, yes, pretty similar. I drilled the holes at 90° each adjustment, with the distance between them the same as the drill. This way the setting can be plus - minus quarter inch.
RyanGi - I made the pin to look antique, copied the top from a plow plane depth adjustment knob.
MikeB. -  the thing I like about it that it's always right there when needed, and completely out of the way when not needed.