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I can't find a picture, but you just bend a strip of aluminum over a half-circular form and then have a roller on an arm that stretches as it passed back and forth. Like a bead roller.
The bracket could be 3d printed.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
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