SS replacements available from Hardin Marine Just got mine and there remarkable.
Something I should have developed,
Ayuh,...... I made my own,....
1/2" x 1/2" -13 ssteel bolt, 2,1/2" ssteel flat washers, an fatish o-ring,.....
I ground a little slot in the head of the bolt, 'n welded one flat washer into the slot, to act as the wings,...
Slip on the other flat washer, 'n the fatish o-ring on, then screw it in,....
(edit) should have added, coat the threads with Perfect Seal, before screwing it in,.....