Jet JWL-1440VS Mode D'emploi page 7

Install the four levellers. These can be adjusted later.
(see Fig 6)
With the help of a second person, raise bed and leg
assembly right-side up.
Rotate the levellers as needed to establish level for the lathe.
Tighten the hex nut on each leveller against the leg casting.
Now headstock, tool rest and tailstock can be installed again
(Fig 7).
Install both studs (N, Fig 4).
Fig 5
Fig 6
Fig 7
Stand shelf:
You can make an extra shelf that rests between the legs if
you wish (see Fig 8).
Installing bed extension: (JET Option # 719401)
The bed extension can be mounted to the upper or lower
holes of the lathe.
Mounting the extension to the lower holes allows use of the
tool support during outboard turning (Fig 9).
Mounting in upper holes increases the spindle length capacity
of the lathe.
Have an assistant hold bed extension flush to end of lathe
bed, and insert four screws with washers (P, Fig 10).
Snug screws just enough to hold bed extension to lathe bed.
Unscrew stop bolt (N) from lathe bed and insert it into hole at
end of bed extension.
Fig 8
Fig 9