Quote Originally Posted by rgsparber View Post
My first thought was to train my eye to better improve my success rate.
That would be best, in my experience.

Just as I have memorized which wrench I need for different hex heads (the head and thread are standardized), the same works for SCHS. If you tend to use the same screws in your designs, you will get the correct driver.

If you are working on someone else's design, you go by thread to get the hex. Works for imperial and metric. I also look at the whole head, not just the socket. Again, that is mostly standard, folks don't want to spend extra money on fasteners, so common usage is standard hex and standard head.