The crown (top) portion of the nut is crimped providing the self-locking.What is the locking mechanism on the nut at far left in the picture?
Not familiar with ZEB as that could be a mfg name. But it looks like a BACN or NAS spec 12 pt flange nut. Whether single use is dependent on the installation instructions. Otherwise you usually check for a minimum tare torque on the nut and compare to spec before reusing it and usually can be reused until the tare torque drops below the minimum.Is it strictly single use, or can it be loosened and retorqued some number of times without losing its locking ability or mechanical strength?
I always replaced those nuts, too. Cheap insurance.
I replaced with new, but am second-guessing myself on one aspect of the process. Wondering if loosening and retorquing would cause any problems.
I had the old style u-bolts. As far as I can tell, they were original from the factory 42 years and 2,000 hours ago. Really happy to upgrade to bar style. I ordered from ACA; I support them when I can.
That does not extend to paying $7,000 for aluminum Grove landing gear, at least not yet. I replaced my sagging gear legs with reconditioned steel gear from rainbow Ron. Appears to be a big improvement, at least based on how it sits. I am anxious to see how it handles.