I’m trying to make it almost 360. There’s a keel at the bottom and a key at the top, matching the one at the bottom. Both sides need to rise at exactly the same angle and meet precisely at the key at the top. What Follow Me tool would you recommend for this task?
You can use rotate and copy. Crate the circle you want the path to follow and mark the center to use as a pivot point. then select the object to copy and press “Q” to rotate and tap CTRL to leave a copy. Move the object to the rotation distance you wish and press enter. then before anything else type "X and the number of copies you need. The repeat the same process in the other direction keeping in mind the radius you degrees that were used for the other side.
Is the curve a circle or arc or is it non-circular?
copyToPath.skp (237.5 KB) not sure sizes or shapes but here is an example.