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Yep - here you go.
Pic 1) The end of the unit with the barlow removed.
Pic 2) Use it like this on step 1 - centring the beam on the primary's centre dot by adjusting the secondary translation and tilt.
Pic 3) With the barlow in place - adjust the primary's collimation screws to centre the returned centre dot image on the screen.
Done!
Cheers
Chris
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