Toika Terhi - Metal Beams & Aprons

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Hello,

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I notice that the Toika Terhi rug loom has metal warp and cloth beams.  Can anyone tell me if these metal beams accept aprons and if so how they are attached to the metal beams?   A picture would be good as the Toika website has very few close-up pictures of their looms. If the tendency is not to use aprons with the Terhi please explain why.