As background: I had my mast off a few months ago. None of the "on the ground" settings were changed on the Reverse Diagonals (RD1) etc. and the rig was put back on by the yard and outside riggers they forced me to use. Afterwards my V1 cap shrouds were tighter than they had been before the mast was removed (just by feel), and the lower diagonal shrouds D1 were lossener (based on how far the screws were screwed in). The prebend all looks good and smooth, but maybe more than before the mast was removed. I finally have gotten underway and sailed in some high winds (all as been on a port tach). On a close reach/reach I noticed my port lower reverse diagonal (RD1) is slack. Everything else looks and feels good and all leeward shroud are tight etc. As I can't think of any reason anything on the windward side of the rig should be loose I tightened a little. But it still is loose and I haven't been out again. Thinking it through, RD1 is used to set the prebend on the mast before setting the mast. That is the last mention of the RDs in the instructions. The only thing I can think of that would cause RD1 to loosen under sail would be for the bend to increase, as if the headsail tried to reduce the bend RD1 tension should increase instead of loosening. In the directions the cap shrouds (V1) get tensioned first to 15-20% breaking strength and it says this will increase prebend. Then you are to tension the "lower shrouds" (D1) to 15-20% which will pull the lower section of the mast back aft reducing prebend. So if my D1s are too loose it seems to make sense that the bend under sail could increase beyond that which was set on the ground using the RDs and that RD1 could become slack. So I'm back to my last thread question of: -how tight are your D1s? And now have a new question of: -do your windward RD1s get slack?