・ Basically, items are shipped on the same day if payment is received by 12:00, but there may be times when shipping is not possible without notice due to sudden illness or other reasons. In such cases, please request a cancellation. ・ Support information will be provided after purchase if necessary in "Mamushi's Flea Market Discussion". This is a listing for extraction unit rails. Extraction unit rails are subject to strong forces, so they may become distorted, but this product has no distortion. There is a controller that controls the fixed position of the extraction unit, and this product is operating normally. In any case, the operation of the extraction unit rail is delicate, and even with this normally operating product, unstable behavior cannot be ruled out, so please be understanding in such cases. To replace it, remove the unit rail holder, then remove one screw from the round hole, and the whole thing will come off. After that, remove the motor power and microswitch from the main unit, and remove the control code from the motherboard, and the extraction unit rail can be removed cleanly. It is not particularly difficult in principle.