Hi Grumpy
Under tension the taper on the dynabolt locks pretty solid into the turnbuckle and you cannot turn it by hand but when it is not under tension, i.e., when the cutter is engaged, then it can be turned relatively easily although it still is firm. Are you thinking it might vibrate loose? So far it hasn't but I have only done a small amount of mowing as a test. Unfortunately the only turnbuckles I had lying around were ring/hook types and of course the ring end is the left hand thread so finding a lock nut might be a bit tough. If it does work loose I will buy a ring/ring type, or a marine type which come with lock nuts, and replace it.
