Woven Electrolux hoses
Here's the deal. Electrolux woven hoses were a very complicated, multi-layer construction. First, an inner rubber layer, then a coiled steel spring made of thick piano wire, then a second rubber layer, then a layer of thin twine, then a layer of thick canvas and finally the outer woven layer.
When the first electric hoses came out (1205), the construction became even more complicated because in addition to everything else the electrical wiring was also embedded. And for the sake of safety against electrocution since the wiring carries 120 volts, the thickness of the two rubber layers was more than doubled. That's why the later Lux hoses were so stiff. (They were also made aggravatingly shorter by about a foot, in a cost-cutting measure.)
Now, the problem with rubber is that it breaks down over time, especially when it is constantly and repeatedly flexed. Ever looked at an old auto tire and seen all the cracks and fissures? Same happens to these old hoses -- the rubber layers break down and develop cracks, and eventually start crumbling away. You can have a hose that, cosmetically on the outside, looks flawless but is a total dud because it's rotten inside.
Here's a repeat of the famous Roger Proehl Hose Test, which is 100% infallible for all woven hoses:
1. Put the hose in a single loop and hold both metal ends in one hand, the ends pointing upward. Make sure the suction reduction valve is fully closed.
2. With the flat palm (not fingers) of the other hand, vigorously pat-pat-pat the opening of the larger end of the hose.
3. If you hear a reveberative, hollow "tonk-tonk-tonk" sound, the hose is good. If you hear a flat "pfft-pfft-pfft" sound, the hose is shot. This is relative, by the way, to the condition of the hose. The better it is, the more hollow will be the sound and vice-versa.
4. The reason for this is simple physics. In a good, sealed hose, when you pat one end of it, the air pressure of the palm-striking sound waves has to travel the entire length of the hose and out the other end, yielding in that hollow, echo-y sound. In a lousy hose, air leaks out throughout the length of the hose, so the sound waves just dissipate.
Hope I have explained this clearly.