I tighten my caps with a dime, and as some of you may remember, even posted a tutorial for a simple mod where I strengthen the slot with super glue. Still, they come apart once in a while. The gap is not really adjustable, it only adjusts how far apart the halves are; not the string gap itself. If you adjust it in far enough to make a difference in the response, the halves come in contact with the string too much, IMO.
On the plus side, you can try different axle materials and even diameters on the same yoyo, or easily replace a bad one.
It wouldn’t be so bad if you could notice it coming loose, like you can with a No Jive, and tighten it back before an accident. But since there are so few turns, it creates a dangerous high-speed projectile when it fails! Makes me reluctant to play with it.
I’m sure some haven’t had any trouble, but that probably has a lot to do with the natural variations of wood; and also the effects of the environment, and changes of environment on wood. For instance, I figured out I definitely couldn’t carry my 2016 EH in my pocket. The changes in humidity and temperature, greatly increased the problem for me.
Personally, I wish I had the earlier version of the EH.
My favorite wood yoyo is the Legend Wing (until I get my Orphan, at least! :D), but I seem to be stock piling a lot of halves! I think I need a drill press, so I can replace their axles. Apparently I have a real knack for breaking wood axles. :-\