The Rocks trailed twice in the match but hit back for a point.
A 93rd-minute strike from Lethbridge, who has made a big impact on loan at Nyewood Lane, proved to be the final say in the match.
He nearly had another goal to win it as well after.
The hosts led atÂ the interval through a 17th-minute strike.
Tommy Scutt levelled for the visitors in the 56th minute.
Bognor found themselves trailing again 12 minutes later.
In a dramatic finish Lethbridge equalised, then was so close to a second withÂ a dipping shot at the death.