My SS rails came a few weeks ago. My interior rails seem to be white oak not ash. The grain is too fine for ash. Anyway the wood screw method might work with some or all of your plugs. I'd try it first. If it doesn't get all of them a properly sized Forstner bit works well, but the plug has to be mostly intact for this or you'll chew up the hole. However, if the wood screw method gets any of the plug out, carefull work with a fine chisel will finish the job. If someone has epoxied them in get a bigger Forstner bit and start over
