These are by far my favorite clamps when it comes to clamping smaller items. They work wit an excenter lever and are able to apply an incredible amount of pressure. At the same time the soft pads ensure that there are no marks left on the surface of the workpiece.
In case you lost one of the soft pads check my article to 3D Print a new one.
Cost of this article are around: 20 EUR
You can purchase the article under the following links: