Sighted guide here. I've raced with a few of my friends with different systems. My favorite was a bungee cord that attached to our run belts. It gave us enough freedom to still move independent of one another while also offering a subtle correction for when we grew too far apart. I've also used braided paracord with a longer teather for a friend with more usable vision. It was more a sign to other people to not run in between us more than anything else. I've used hand teathers before, but they really mess with your stride if your partner isn't super similar to you in running patterns.

So I had this one time when I was in twelfth grade gym class, and for running I held one end of a towel and my sighted guide held the other end and we ran that way I thought it was safer than doing standard sighted guide to have someone like half a foot or so in front of me. My sighted guide would also of course say when we were coming to hills or bumps in the track.

Yeah I run with a guide every weekday morning, We use a cord that is attached to our wrists and synchronise our stride. We’ve been running together for 4 years now so he understands that i need warnings before stuff and I have got to know his pace and stride. The route we use is very familiar and in summer its streets and parks, in winter it is the campus and the track. We’ve done a lot of 5/10k races and one marathon although he didn’t manage the marathon and I had use my brother as a runner from the 18m mark. I’m hoping to do another marathon in spring but this time plan to have two guides who do 13 each, that way I might have a shot at the T11/B1 elite classification for future.

What city/state are you running in?
Might want to look into a group called Achilles.