We have five sections now. I don't know if the forum software allows sub forum sections, but knowledge management best practice is to use searches for keywords or other metadata to narrow search results within the main sections. I know the moderator, there's only one these days, doesn't need any extra work, so it has to be user controlled. I doubt we would get too many posts as you drill down on some of them, but a search for camshafts, for example, will produce everything in a section, or the whole forum, where that word appears. It doesn't provide a list of all those words, but there might be a sticky way to make a list of all the relevant words that are hyperlinks to the searches. This I could do with some help from everyone in assembling the lists of words? I will provide an example later this evening here for you to see and test.