I used 6" schedule 40 pipe for the drum.
It measures 6 1/16" ID, 6 5/8" OD, 9/32" wall
This seems to be a common drum diameter between several manufactures.
The axle is made from 1 3/4" diameter 1045 cold rolled. ( most rakes use a 1 1/2" axle, but I had some 1 3/4" bearings left over from...