Photo 1 - On the first brake line I did, I made the mistake of getting the line all bent to shape without the collar close to the flared end. I was able to wiggle it past the tighter bend but just barely. I may make this one again because when I torqued the fitting, I think I went a bit too far and I'm worried I could have damaged the flare. Debating whether to just do it again now or wait till I bleed the brakes and see if leaks. Hmm..
Photo 2 - This was my 2nd brake line (left leg). This one went much easier.
Photo 3 - Another thing I learned when doing the first brake line was to go ahead and flare both ends while the pipe is straight. If you make a tight bend close to where the flare needs to be, it doesn't fit well in the flaring tool when it clamps down on the tube. You can't fit the spring bending protection device on the tube when you have both ends flared, but I don't think that's a big deal as long as you're careful to not kink the tube when you make the bends.
Photo 4 - I picked up a pack of dental picks from Harbor Freight. Unbelievable how low the prices are there. I don't know how they make a profit. I paid $2.99 for 4 picks. They are quite small and fit in the thread groove perfect to remove the powder coating. I didn't want to get too aggressive as I don't think scratches in the root of the threads is a great thing. As I said before, this thread will just be hanging off the end of the shaft after the nut, so it won't have much of any load on it so probably not a big deal anyway. I was able to get the nut on now, but I can tell the very start of the thread on the shaft got a little galled up after my repeated attempts to get the nut to thread on. So, I'm going to wait to fully assembly it until I get my thread file from Amazon (arriving tomorrow). The file will clean up that part of the thread and make it nice and smooth. So excited to get it on its wheels. Next will be brake bleeding which I'm hoping to borrow Mark's tool and maybe get someone to help me who's bled brakes before. I anticipate some of a mess that will be unavoidable, but would be nice to have someone helping who has done it before.