Duff’s were made in Haverhill, MA, just up the road from us. They are smaller than most mills of that vintage, and many of them went to hobbyists half-a-century ago. We like them because they’re more easily moved than their larger cousins, and they take up less floor space. Their distinctive green paint also livens up the shop a little. Our favorite Duff bores our titanium stem tails to perfect roundness.