I came across a well used 686 CS-1 3 inch about a year ago. The front sight had been filed on and other wise badly damaged. S&W had no 1/10 front sights. I took a standard 1/8 front sight blade, of S&W mfg, just like the 1/10 and narrowed it to 1/10. Blued it and installed. Looks just like the orginal.