Can a 4:1 knob be put on a 75A-1? I have one on my R-388 and love it. Also looking to purchase one. Phil Philip LaMarche LaMarche Enterprises, Inc. www.instantgourmetspices.com <http://www.instantgourmetspices.com/> www.W9DVM.com <http://www.w9dvm.com/> 727-944-3226 800-395-7795 pin 02 FAX 727-937-8834 NASFT # 30210 W9DVM