I have a really big bail at the base of the mast. The kind that is v shaped (Schaefer). With the boom on port the line exits smoothly from the fiddle block to the organizer. The block and the organizer end up 8" apart. After gybing the boom to starboard the distance between the block and organizer is 24". Puts a great load on the vang in heavy weather as the line gets pulled in tighter. The mast bail and the snap shackle on the fiddle block move the exit from the sheave about 12" away from the mast base. I don't always have the opportunity to uncleat and recleat the vang on a gybe.
I'll forward some pics.