To sell effectively on ebay, always make sure your title is descriptive and clear, your description is complete and includes the condition of your item and its specifications, and ALWAYS have a good photo or two. When you write your description, try to include as many different words and phrases you can think of that people looking for your item might use in a search. For instance, an underpinner might be called a vnailer, frame joiner, mitre joiner, etc. Choosing your category can be important for people who browse but don't search for specific items. Ditto to John - If you have what people are looking for, you will sell more at a higher price.