Which size alan key for Astrotrac polar scope grub screws?

[symesie04]

Hi

Just as it says on the tin. Need to collimate my polar scope and whilst at it thought i would replace the grub screws with thumbs screws. However I have a range of alan keys and torque drivers non of which seem to fit despite looking about right. So anyone happen to know the correct size of alan key required for the grub screws?

[m.tweedy]

3 mmhttp://www.fredmiranda.com/Buzz/Collimating%20The%20AstroTrac%20Polar%20Scope.pdf

[StuartJPP]

The supplied grub screws require a 1.5mm allen key to remove. The thread is 3mm.

[m.tweedy]

The supplied grub screws require a 1.5mm allen key to remove. The thread is 3mm.

You are totally correct. :-)

[symesie04]

Brilliant thank you gentlemen.