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More professional units use a straight shaft with a gearbox at the cutting head end. Top-of-the-line units use a straight "split" shaft with a disconnection point partway along the shaft, allowing the cutting head to be replaced by other accessories such as pole pruners , cultivators , edgers and hedge trimmers .
Many string trimmers allow the hub, the head or the lower part of the shaft to be replaced with accessories. Common accessories include: metal or plastic blades; a small chainsaw; a toothed hedge trimmer; a cultivator; Quick-release shafts are offered on many newer models which do not require any tools to switch in accessories. [citation needed]
Wedge — an unsharpened blade for digging, breaking and prying. A San Angelo bar has a wedge at one end. Chisel — a sharpened blade for cutting roots, digging and prying. A pinch point bar has a chisel at one end. Bars are typically 5 to 6 ft (1.5 to 1.8 m) long and weigh 15 to 23 lb (6.8 to 10.4 kg).
In engineering terms, three-point attachment is the simplest and the only statically determinate way of rigidly joining two bodies. A three-point hitch attaches the implement to the tractor so that the orientation of the implement is fixed with respect to the tractor and the arm position of the hitch.
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