Pete S:
An alternative, and you need to be very careful with this, is to keep goingaat snails pace until you JUST touch the barrier. If you a judged to have dislodged it in any way, it’s a serious (fail) fault. But touching it is fine.
Odd isn’t it. On your test, if you hit it you fail, but in the real world, you have to hit the bump stops on bays to make sure the gap is small for tipping.
Ken.