If you have ever flown somewhere and wanted to tie down, you probably discovered the battleship class ropes at the airport don’t fit through the 3/8" tiedown hole very well. So, I made these:
Cheap Amazon 1" wide aluminum, bent around a socket and squashed in a vise. Then drilled to 3/8".
Installs without tools. Weighs about 0.2 lbs for the pair, probably mostly those 3/8" bolts. I might look for aluminum bolts or pins.
I use something similar to this:
I’ve thought about this even though my plane isn’t even close to flying. What about just some D clips?
I’ve got one buddy not on the forum who uses D clips/ anchor shackles. For the weight conscious I think you can find them in titanium in sailing circles.
A couple good quality carabiners or D rings are good to carry in your plane so you can always have something to hook on to any type of tie down. If I go on a trip I carry the ratcheting straps mentioned here.
