Roger, roger ... I think that was the reason Hall upgraded to the larger turnbuckle. But before you think I am endorsing Hall they built me two forestays a week apart when I upgraded 505 and 526 roller furlings ... and they were built to different specs. One fit fine and the other we had to customize with a grinder because of different fittings.
But the turnbuckle I have on 505 is the one photo in my post above and as you can see is big screwdriver tune-able.
As I remember a big, strong vise grip on that center that is slipping makes it work, but I wouldn't want to do that for every race.
Mine are starting to show corrosion and I am thinking waterproof trailer hitch grease.
