Check the listing for details. Delta Rockwell 17” DP-600 Drill Press NJ-220 Return Spring Knob & Jointer. Color: Solid Silver Silk Knob, Condition: New. Listed at 10.00 USD. JUNK HUNTER ENTERPRISES DELTA 17” DP-600 DRILL PRESS NJ-220 ART DECO RETURN SPRING KNOB $10 to $12 + Shipping I designed these Art Deco Return Spring Knobs in the same style as the original 17” Drill Press part. The threaded portion is chased with a tap to dial it in perfectly. I tested this on my own drill to make sure there’s no slipping with multiple drilling actions. These are also the same knobs used on some of the Delta Jointers. Everything is 3D printed out of durable PLA plastic. The standard recessed Silver Silver Knob is $10, the Silver with Red Stripes is $11 and if you want a custom color set up, a solid knob is $11 and a two color is $12, shoot me a message to discuss color options. So $10-$12 per knob, plus shipping.