My favorite "cheap" helping hands unit has a single pair of "tweezers" on a ball and socket arrangment and a cast base. I love it for holding wire and cable or connectors while soldering. It will also work for small circuit boards but for those I like the double alligator clip units (also a cheap unit). I slide a short length of silicone tubing over each of the alligator clip jaws to keep them from gouging or marring the boards. Better units are, well better. The Panavise is a good suggestion if you want to spend the money. But my cheap ebay helpers have done the trick, I have no complaints.