Making a union piece for Citroën BX front strut leakage return/breather pipes.
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A 53 mm diameter dent is bored into the head of a teflon bar, and a hole is machined in the middle of the dent.

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The part is sawn off and a groove is made on the other side.

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A 3 mm diameter hole is drilled through an m6 threaded bar, and the thread is machined off the other end.

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3 mm holes are drilled holes are drilled to the cental hole, then widened to 4,8 mm except for a small bit at the end, and m6 thread is tapped.

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A 5 mm bearing ball is inserted into one of the holes, followed by the threaded bars, and the part is put around the strut in order to see how it fits.

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After checking the fit, a gasked is cut..

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..and the part is fitted again for a leakage test.

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The parts.