The processing of the adapter is perfectly fine: The thread seems to cut clean, the rubber looks durable and robust.
However fulfills a simple adapter screw without plate, as for example are they from Walimex and many other providers, their job even better than this adapter.
a) It wobbles.
The Manfrotto adapter has indeed a plate. However, this board has only 30 mm diameter. But pan and tilt heads and the center pillar plates on tripods tend to have 60mm diameter. It is therefore not used the full diameter, but the tripod head with camera is only half the diameter. If there is the fact that the adapter (as given here) with a rubber layer (flexible) is coated, it wobbles. Only the screw and the small contact area can still play on! And a shaky tripod is useless.
With one of these smaller screw adapter tripod head is fully in contact with the center pillar panel. Nothing is loose.
b) No security nut.
Good tripods have outside on the center plinth in a circle arranged three allen set screws that can be rotated as a rotation upwards. Manfrotto heads have for example corresponding indentations on the bottom.
However, this Manfrotto adapter has only 30mm in diameter, so that the anti-loosening securing can not be used. The adapter will loosen by the rubber is not necessarily the head, however, because it is not backed up by the tripod.
A simple screw adapter (quasi hollowed screw with internal and external threads) makes a steady and losdrehgesicherte connection, even if it covers only 2-3 threads.
Simply screw into the head until it is flush with the countersunk screw holes and screw the head on the tripod.
The full width is used -> nix wobbles.
The rotation can be used -> safer.
I thought I was doing my Manfrotto head what good, as I take an adapter from the same manufacturer. Nope. The 088 LBP goes back, the simple adapter screw is already mounted and now wobbles nothing more.