A combination of a gorilla mechanic and inept tool user led to me ruining my inspection cover (for turning the crank while doing valve lash adjustments)... so I ordered a new one with o-ring (whopping $9 from my local dealer) and found a rather nice improvement:
Old on the left (needing a drag-link to remove, too many inept tool users ruin these things with Lord knows what ~ I've had to replace lots on different bikes), new on the right.. uses a 10mm allen, kinda hard to F-up
And even the back side looks like it has more 'substance' to it, which means it'll be hard to twist the center out (something I've personally done):
Just nice to replace something and have a Better part go on than came off.