JUKI DSC-246 Instruction Manual page 12

1. Mounting position of the knee lifter
(Caution) The knee lifter should be mounted before the moter
is installed.
2. Carry the sewing machine with two persons.
(Caution) Do not hold the handwheel.
3. Do not put protruding articles such as the screwdriver and the
like at the location where the sewing machine is placed.
4. Setting the sewing machine
Holding countersunk screw
with the unit,  x the sewing machine on the table with aligned
with rubber packing at four locations.
5. Securely attach head support rod to the table until it goes no
further.
, washer and nut supplied