Size of set-screw on Tesoro knobs (Allen head)

[Bazooka]

Hi folks,
I have a 3 year old Tesoro Vaquero, and the disc knob is becoming wobbly because I thumb it constantly. In order to tighten it down I need to pull the knob which is held down by the tiniest of set screws, allen head. I can't find an allen that fits this thing. Does anyone know the size of wrench I would need for this set screw?

Thanks,
Baz

 

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[slowNsteady]

1.5mm. Thanks for reminding me as I need to adjust mine a bit too.

 

[Bazooka]

Thanks slow&steady, that was it. All tightened up. On to the gold finds......!! Eh-hem, I mean zinc penny finds. Ha ha.