Join Date: Apr 2013
Location: Columbia, Missouri, USA
I'd leave them off and not substitute with anything. The rods are held on by bolt stretch, locknuts at that low torque setting adds no security.
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I certainly do not claim to be smarter than the designers, but I was wondering how much good those lock nuts could possibly be doing at that low of a torque value. My only thought was it was possibly related to harmonic vibrations. We encounter plenty of that engineering consideration in turbine engines.
1988 Spider Veloce (with lots of 3D printed parts)