Last week I managed to get rid of the hook at the top of the mast - basically by rolling back to everything loose and re-tightening. I suspect the D2 pressure induced the hook.
Afterwards though I took a picture up the mast track decided the mast was not longer in column. One of the problems I had been having was setting the D2 tension so yesterday I went back up, dismantled them, cleaned them and had another go. Cleaning them made a HUGE difference. Previously the idea of hand tight was impossible, as you couldn't turn them by hand even when loose, now you can and I feel more confident about their tension.
In the picture below you can see the turnbuckle - there are rotating sleeves at A and B. As pressure increases A will likely bind and you have to be careful too not rotate the rod rigging - I started by trying to grip the rod but moved to gripping the turnbuckle body instead.
Straight? Straighter for sure.
Notice the lack of bend up high.
Old shot for reference
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