jayhawk
I put a 1/4 inch hex socket on it - but the other way around: with the square female on the square male of the extractor (which, obviously, happened to be 1/4 inch too). Then I put an allen socket in the hex socket. Then you can put anything you like (universals, extensions, ratchets etc.). I do not know whether there may be square sockets available that would directly fit. I did not use a drill at all.
Bruno

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1992 300TE 160 kmiles