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the block is sometimes padded to avoiding marking the frame, but is not as effective a lever as the traditional grooved type. As this type of stretcher is usually used by pulling rather than levering, it tends to leave the webbing slacker than traditionally expected. The pins can also damage the webbing, if used to apply an adequate force. This type is commonly used for making cheap furniture, where rubber webs are
73:. To provide a taut and long-lasting seat, the webbing must be tightened into place. The webbing material must also resist yielding over time, hence the use of a dense herringbone weave, rather than the cheaper hessian webbings also used in upholstery. Where wire springs are to be placed over the webbing, the more abrasion-resistant cotton webbing is used rather than jute.
106:. This looks like a bat or paddle with a simple handle, a locating groove along the opposing edge and a slot in the centre. The webbing is held in place by placing a loop through the slot and locking it with a wooden dowel pin. This pin is usually attached to the stretcher with a short chain or string. Using chain avoids the inconvenient twisting tendency of string.
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These are mostly used by direct pulling, rather than levering. A wooden or plastic block has a row of sharp raised point to grip the webbing by piercing it. The block is either held and pushed to tension the webbing, or a turned wooden handle on a gooseneck wire is used to pull it. The other edge of
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In the 1950s, an elastic rubber or 'Pirelli' webbing became popular. This is made of black rubber, with an internal canvas reinforcement. This webbing is applied by hand and is not tensioned, the elasticity of the rubber being sufficient. It is attached by metal clips, fitting into grooves in the
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stretchers are sometimes used, particularly with leather strapping that is too short to allow a loop through a traditional stretcher. These have wide ridged jaws to grip the end of a webbing. A protrusion on one jaw acts as the fulcrum of a lever, to give a powerful tensioning force.
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of a lever and the stretcher is levered outwards. As the handle is further away from the fulcrum than the slot, there is a mechanical advantage of about 3:1 in the tensioning force that can be generated, compared to simply pulling.
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frame. As the webbing is elastic it is only used in parallel strips, rather than being interweaved: friction between these elastic webs moving over each other would soon abrade their edges.
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When the webbing is attached, it is fastened at one end, stretched into place and then held in place with
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permanently into place. As rubber only requires a low tension, they are adequate for this.
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In use, the grooved edge is located over a convenient edge of the frame to act as the
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189:. Guild of Master Craftsman Publications. pp. 166–167.
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Traditional chairs are constructed of an open wooden
102:Tensioning is done with a simple wooden lever, the
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53:, with their seat often supported by interwoven
125:make their own though, from workshop offcuts.
211:"How to use a webbing stretcher / strainer"
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25:Traditional wooden webbing stretcher
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167:"How to use the webbing stretcher"
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256:"Gooseneck Webbing Stretcher"
187:Upholstery: A Complete Course
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69:over this and finally the
244:. J A Milton Upholstery.
216:. J A Milton Upholstery.
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121:. Many
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