by Raymond » 20 Jul 2015 20:39
If you took it off it will go back on the same way. Note that the hole for the retainer is 15 degrees down. This means you have to rotate the inner part of the knob the same amount to see the retainer. If you take the knob back off and look into the side you will probably see the retainer. Also remember that the retainer probably will not go in unless the key is in and turned as the tailpiece blocks the retainer. (there are a few exceptions)
Nothing is foolproof to a talented fool. Wisdom is not just in determining how to do something, but also includes determining whether it should be done at all.