Use and adjustment of heavy machine sewing machines (mb-372, 373-type nails) (i) placing an anti-shock rubber gasket 1 on the installed head of the sewing platform (the hole pointed to the hole), then pointing to the installation hole and placing the head above the anti-shock rubber pad 1, with a tight bolt, two, three, four, and a fixed screw; and (ii) loading the s-type hook 6 and chain 7 onto the starter pole 5. (i) add “heavy buttons” no. 1 oil (lubricant oil) designated by the “heavy engine company” in the holes and parts shown in the arrows in figure 2; figure 2 (ii) open the hood on the right side of the head, remove the bolt 1 on the wheel of the belt (as shown in the left figure in figure 2) and add butter (lubricose); (iii) corset with bolts 2 (tight bolts installed on the head) and then drop the head, and add butter (softose grease) to the wheel 3 and snail 4 (as shown in the middle figure in figure 2); and (iv) check whether there is sufficient oil on the inside the installation on the bottom of the aircraft, and if there is insufficient oil, refuel immediately. 3. The method of installing the needle shall be to cut the power of the motor before replacing or installing the sewing needle. According to standard: tqx7 16# needles should be used on the mb-372 nails; tqx7 20# needles should be used on the mb-373 nails. The operational steps are as follows: (i) the needles on the pins (as shown in figure 3), hold the needles in the direction of the operator in the long slot of the needle 2; (ii) the tails of the needle 2 (known as “the handle”) are inserted into the holes at the lower end of the needle (the pointers are fitted) and are to be inserted at the bottom of the hole (plug); and (iii) the bolts are to be tightened to the bolts 1. Figure 3 iv. Method of installation of needle shielding out
