J bolts can be inspected with ecographic sounding, as for
rigging
Better in A4 than in A2, or SS 316 vs 304
I just added a second NUT (HIGH) and greased top
First and last one are the most prone to failure
PS check size/number vs
displacement and ballast. Stress comes with heeling and hiving, not static ballast weight
For 8tonn ballast, I have #12 1"1/8 bolts. Ballast fin is 7' long