Hitachi GP 2 Mode D'emploi Et Instructions De Securite page 12

English
Wheels can be simply attached and detached by using two wrenches. (Fig. 3)
Tighten
NOTE: Do not tighten the collet chuck by inserting a shaft thinner than the
regular shaft diameter (1/4''(6.35mm)) in the chuck or in an empty
condition. This practice will damage the collet chuck.
When installing a wheel with shaft, tighten the collet chuck after applying
a small quantity of spindle oil (or sewing machine oil) to the tapered
portion indicated in Fig. 2.
7. Using the side handle (Fig. 4)
Be sure to use the side handle to avoid the risk of severe electrical shock.
Attach the side handle to the machine as follows.
(1) Loosen the side handle grip and insert the side handle to the nose bracket
part of the machine from the flange part of the side handle sleeve.
(2) Set the side handle to a position that is suited to the operation and then
securely tighten the side handle grip.
Side handle
Side handle grip
Loosen
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Spindle
Collet chuck
Side handle sleeve
Flange part
Tighten
Fig. 3
Fig. 4