English to French Tech/Engineering nettoyage des conduits d'air

Whipper Tubing Replacement Procedure
When one of the four flexible plastic air tubes extending out of the whipper body is shorter than five inches, or it is missing, it must be replaced. Use the following procedure:
1.Use flexible plastic tubing and a stiff tubing straw that is available from Steamatic.
2.Remove the flexible tubing that is going to be replaced by grabbing the stiff tubing in the middle of the whipper body with tweezers and pulling it toward you while holding the whipper body in your other hand.
3.Cut off a six inch piece of new flexible plastic tubing.
4.Insert the end of stiff tubing straw 1/16 inch into one end of the flexible plastic tubing.
5.Cut off the stiff tubing straw even with the end of the flexible plastic tube with a small pocket knife.
6.Place the flexible plastic tubing into the middle of the whipper body and into the hole on it’s side.
7.Pull the tubing through the hole until most of the tubing is through the hole and the stiff tubing straw is snug against the inner whipper body.
8.Connect the stiff air line and the air compressor to the whipper and hold the tubes in one hand.
9.Turn on the air compressor and allow the tank to fill.
10.Hold the four flexible plastic tubes firmly in one hand and turn on the whipper air lever.
11.Make sure there is not significant air leakage around any of the holes where the tubing extends from the whipper body and that air flows out the ends of the plastic tubes.
12.Turn off the whipper air lever and disconnect the stiff air line and the compressor from the whipper body.


en fait il s'agit d'une tête de nettoyage (un batteur) à laquelle sont fixées 4 tiges plastiques flexibles (les fouets), il faut remplacer l'une des tiges mais je ne comprends pas comment on la fixe au batteur. Les 2 into de l'étaoe 6 désignent-ils un même orifice ? Ils disent de l'enfoncer presque entièrement (étape 7)mais alors il va en rester très peu à l'extérieur ?