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Nice find I had to replace the 20mm mount on my Auto head with a 30 int as I couldn't find any.Interesting to see your adapter sleeves I normally just make a sleeve that goes into the 16mm hole but yours have a knurled end and one has a hole for the clamping screw to go through rather than a slit Jo
They are part of Festool Germany now but their old factory is just down the road from me. They make really good quality tooling but prices are not for the fainthearted.