Allen key size for Argosy knobs?

[john@antenna.demon.co.uk (john@antenna.demon.co.uk)]

Please would somebody tell me what size Allen key fits the grub
screws in the knobs on the Argosy II ?  I'm trying to get the front
panel off but my smallest keys (1/16 inch and 1.5mm) are too large to
release the knobs.  I could grind a key down but I'd rather get the
right size.

Cheers and 73 de John, G3RHP
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john@antenna.demon.co.uk                        g3rhp@amsat.org