by 13brv3 » Sun Oct 06, 2013 2:48 pm
I get asked this question occasionally, and the answer is just to eyeball it. Particularly with longer props, it's pretty easy to see when it's level. When you fly, you'll immediately notice if one is off, since it won't be in the same plane as the others.
The harder part is actually making a small precise adjustment. I typically leave the mounts loose enough that they can still be turned by hand with some force, but they tend to want to jump too far when turning them, so it's hard to make small adjustments.
I've always resisted making anything special about the tubes, because that makes them harder to replace. You can buy plain tubes lots of places, but if you need a nut pressed into it, or special slots, then you're probably stuck buying from the original kit maker.
Cheers,
Rusty