Just wanted to reply to a few things here. I understand that this might come off as "I am careless, how do I fix it?". Being careless is not the issue, I have no desire to re do things or put peoples lives in jeopardy.
Distraction for me (a person with ADHD) can be instantaneous. The type of distraction that others have mentioned can obviously be a problem for me or anyone. The kind of distraction I am referring to can be caused by someone walking by me or the sound of a door opening. There have been times when I am distracted like this and whatever I was doing (say, tightening a bolt) might as well could have never happened since my brain is already on to the next thing. Unfortunately, my brain is wired that way. I am trying to come up with methods to combat this tendency so I don't screw things up. It's easier said than done when you have to undo a lifetime of doing things a certain way.
But you know, I have come to realize that I may have been a little arrogant before and have never really instituted any rules for myself, like 'double check your work'. I have come to the conclusion that this attitude does not work. Hopefully this will help me to slow down and think before I let something fly. What can I say, better late than never.
I did actually use the paint pen method on a subsequent brake job and it worked OK. I also had a pretty big job to do where I had to take a lot of stuff apart. When I put it all back together, I paused at each 'threshold' to make sure all fasteners were tight and anything else was back in its proper place. I also tried to keep my cart as clutter free as possible. I did a good job and everything went back together smoothly. Yeah, it took forever but warranty paid 5 hours so it was not an easy task. I was proud of myself!
Thanks for all the advice, suggestions and encouragement, its been very helpful.
- Greg