Getting ready to start using the RC 2060 Rotary Cutter that I purchased last year. Its not been used since last summer and has been sitting outside. It has a slip clutch instead of a shear bolt and I understand that I need to loosen the bolts that hold the clutch plate and bellville spring together and make sure that it slips to protect my pto drive. Once that is accomplished I need to adjust the six bolts back to a 4 MM gap. Thats where I am metrics challenged. Looking at a feeler gauge .016 is also .406 MM. Is that 4 MM plus the 06 or is the .406 a bit less than one half of a MM ?