It is a 1/4 roll pin that goes all the way through. The center of this hole is 2"
from mating surface. It hold the quick release mechinism on the blade. The blade shaft is 1 and 1/4 " O.D. the quick release is 1.6" O.D.
The quick release button is 3/4" the hole for it is 6" center from mating surface
I am an American Whitewater member. One of 6300. There are an estimated 100000 paddlers in the U S. If you are not a member you should join. AW is fighting for our rivers everyday and could use some help.