Ron - not sure about you but I post here in between phone calls, conversations or while waiting for other stuff. I suspect others do the same. Errors are easy to make - but the important thing for me is to illustrate the thinking process, do the math, so to speak, which helps the originator and other readers to carry on from there. Corrections are never a problem, in my mind. As you say, best to make sure the right information is out there. Now and then I'll see errors that jump right off the page and I point them out. I don't worry too much about being a little wrong nor pointing out errors. That's all a part of the interaction that makes it a good forum.