I tend to agree, Richard, but thread drift is a fact of life, and it's extremely difficult to know where to make a break as the drift often starts very subtly.

The same thing can be said about thread gluing. It's normally very difficult to glue two similar threads together, as whatever you do, the 'flow' of each part of the new consolidated thread is bound to be disrupted, and searching for a particular theme gets even more difficult.

I suppose we should look at the threads more as a discussion and less as a thesis about a subject, and put up with the search problems that creates.

My 2c!

-David C.