An adjustable limb support includes a hinged vertical support trough that is movable about a central pivot post and is attached to a pair of hinged support arms, the hinged support arms being horizontally adjustable at one end to allow for vertical height adjustment at the other end. The area of compressive fabric in each pant leg also includes a pair of pockets positioned to lie on either side of the athlete’s knee. Additional variants and embodiments may also be disclosed and claimed. The user is able to convert to a desired channel conveniently by viewing the channel OSD indicator that includes non only the channel identifiers of the selected channel, but also channel identifiers its adjacent channels. 5\xb0 or more and less than 90\xb0. The transfer unit has at least one spider that feeds the groups successively into a forming beam of the winding unit, and at least one release drum that releases the groups successively to the spider.