Patching a rust hole in the Citroën BX A pillar.
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Three days until MOT, and the slight rust problem on the port side A pillar has not disappeared. No time to change the windshield, so..

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..it's time to take the pneumatic hacksaw out.

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The hole is cut to a somewhat more regular shape as far as it's needed to find healthy metal..

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..a cardboard model is cut..

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..and fitted to the hole.

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Using the cardboard model..

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..the shape of the patch is drawn to a piece of leftover 1 mm roof panel..

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..which is then marked with the correct direction..

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..and cut out of the sheet.

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The leftover glue is removed..

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..and the surroundings of the pillar are protected..

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..in order to apply a layer of zinc paint.

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An additional sheet of roof paneling is fitted to protect the glass from heat..

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..the patch is fitted..

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..welded at a few points first..

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..and the seam is completed.

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Zinc paint is applied to the seam..

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..and the patch is bent downwards and welded along the edges.

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The end is cut to final dimensions..

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..so that it meets the edge of the hole..

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..it is welded fast..

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..and the seam is smoothed by a handheld grinder.

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An additional patch is made..

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..fitted to the remaining hole..

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..and the welding is completed.

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Some zinc paint, followed by red paint..

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..and the Old Lady is ready for yet another MOT inspection.