Pointer Control Knobs, Custom Plastic Molding Part No. 1550AG Plain Hole Hole Shaft Depth Dia. 1/4 7/16 Set Screw 8-32- http://www.daviesmolding.com/cgi-bin/part_ser.pl?page=pointer&series=1550&photo=pointer&back=starknob&next=instrument1/29/2006 4:41:55 PM