Installing the arms was the last major thing remaining on this chair. They are held in place by half inch dowels, two through the back into the arms and two through the arms into the front legs. I clamped them securely into place and drilled the holes:
I would have liked to use a brace and bit for this, but, if there is a bit that will make a hole in white oak end grain, I don't own it. My only alternative is a cordless drill and brad point bit.
I cleaned out the holes carefully by running the bit in and out several times. Because I know dowels are a tight fit, I put them through the dowel former multiple times and even drove them dry through the hole in the back for good measure. Nevertheless, when I applied glue to the dowels, it was a real struggle to get them in. I wish my Lee Valley dowel former was a bit more undersized (I checked the drill bit and it is dead on.).
All's well that ends well, and the chair is finally ready for finish. Notice how the arms make a second Timberline arch: