Hey guys:
Here's those measurements I promised. (I finally got around to taking the auger off the PHD head today.)
PHD head: male shaft, round, 2" OD, solid, with a 5/8" bolt hole about 3/4" from the end.
Auger: female shaft, round, 2" ID, ~3-1/4" OD, 5/8" bolt hole 3" from the end of the...