Before use, apply the stretching spray to the area of the shoe or boot to be treated: it softens and prepares the leather, making stretching easier. Open the supports by turning the handwheel so the forms can be inserted. Insert the forms and bring them together with the handwheel until the shoe can be inserted; the machine works on most shoes without supports. With leather that has little elasticity, when stretching by more than one size on closed shoes, it may be necessary to add the heel support of the appropriate size and the adjuster to make the back fit as closely as possible. When working on large sizes, add the under-form support. Close any zips before operating the machine to avoid damage. On laced shoes, the lacing must not be too tight, and the corners, seams and eyelets underneath must be moistened with stretching liquid to avoid tears. Operate the machine gradually until you feel slight tension on the material, without forcing, as excessive stretching could damage the shoe. Leave the shoe or boot under tension for the necessary time, then loosen and carefully remove it. Try it on and, if necessary, repeat the operation, increasing the stretch a little at a time. Proceed with particular care on delicate materials, such as thin leather or patent leather.