Those arms in much heavier 944/944T race cars are running pure coil-overs and that single shear bolt on their arms. I am doing the same in my Bug and have no thoughts drilling or welding the cast aluminum arms. If I was that worried I would rather replace the arms with the heavier Mendeola arms. I am working on making the upper shock mount double shear on two chassis now and will post on my build thread as it plays out.
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Meyers Manx Signature #85 , 79 Convert
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