What FB says.

I usually "pre-mount" my wheels in the stand - but always sit the bike back on the ground and open/reclose the skewers. About half the time there is a small thunk as the bike sits down completely on the axle like it should be.

I learnt this trick from my time as a mech for a contract company maintaining ambulance bikes. A letter from the company came around saying "thou shalt, without fail, mount the wheels on the ground" - I guess one of the other mechs had mismounted a wheel in a workstand.