Gramercy Holdfasts – buy some
Simply put, they are inexpensive ($29.95 a pair) and fantastic. They quickly and easily hold the wood in the workbench with surprising strength, but with enough delicacy to minimize the risk to the wood. Any workbench with 3/4" round dog holes and sufficient thickness should work fine.
They are one of those tools that I didn’t know I needed until I had them.