The eyestraps allow the line to move to either side of the sail. As a side note, we also use the lazyjacks when reefed to  gather the sail up, instead of reefing lines. The black line on the boom is the single line reefing. Interesting but a little confusing , based on the photos; you and George differ quite a bit on your lazy jack systems.  Since both work well, perhaps the arrangement isn’t as critical as I thought. Your top wires go all the way to the top of your mast while George’s appear to be tied off at the shroud tangs. It’s hard to tell on the boom photo, but it appears that the cheek block and cleat are placed aft of the mainsheet while  George’s appear to placed forward of it. I wonder if that makes any difference. 32 Still Another  ooking up the mast, you can see the attachment at the top of the mast and the rings mid-way. Sorry I don't have an  over-all view; this was as far away as I could get on the boat. L 