I added a QBP 'locking spacer', directly above my top headset race
on my integrated headset, it's another pinch bolt to loosen
while you adjust the headset pre load,

But its another bit of clamping force around the steerer tube once you snug it down

I added mine to keep it from letting the fork fall out, when I take the stem off.
and pick up the front of the bike.
like for packing the bike in a box for a trip.
they're thinner than a seat post band clamp, and have no shoulder.
like the clamp that sits on top of the seat-tube would.