Slotblog's "Search" feature is a useful, yet very underused tool for finding answers to many common questions.
Type in a word, example, "compressors", click the square green button, and it will find a wealth of historical Slotblog discussions on the subject.
The trick is to scroll down past the ads until you see genuine Slotblog threads.
I don't mean to dissuade people from asking questions. Just showing you a tool that really works well. Try it, I use it all the time