I have one of these tool holders and I doubt that the rocker section
is a Woodruff key. It's about 40mm long and 12mm wide. I don't think
Woodruffs are that thick. It's also fairly shallow from the flat
surface to the curved portion. I think Woodruffs are much deeper than
this.
This tool holder will easily take a 1/2 inch tool bit.
John
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Ian, that rocker sectiopn looks suspiciously like a Woodruff Key,
