Genuflections on both knees should only be made on entering and leaving
the sanctuary, and when servers have to leave the sanctuary and each
time on their return.
Acolytes and servers must genuflect on one knee each time before going
up to the altar and again on the predella before descending.
For the Lavabo the servers await the coming of the celebrant on the Epistle side.
N.B. This edition of The Altar Server’s Handbook,
originally published by the Archconfraternity of St. Stephen a century
ago, contains in its pages directives which do not necessarily
correspond to the 1962 Missale Romanum
or the serving tutorial on the Sancta Missa website. The handbook is
intended as a possible aid for parishes or individuals interested in
implementing a similar guild.