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After a few hours of cursing and scratching my head, I think I got it all together now.
The image train from scope to CCD is as follows:
Focuser - MCPP (with MPCC adapter) - TOAG body - 18+5mm spacers - 13mm nose piece from the QHY camera - CCD itself.
For the guider, I had to screw off the C mount adapter and plonk the guider body into the 1.25" cup and secure it with the two grab screws from the side, secure enough.
I tested the setup under the stars, and the focus is spot on with the CCD but slightly soft with the guider, which is fine as it still allows for picking up guide stars.
This set up does have a downside: the distance from back of MPCC to CCD is now 62 mm (due to the extra 5 mm spacer added to the 18 mm spacer). However, if I remove the 5 mm spacer, I need to lower the guider by equal amount, and I just don't have any spaces left to remove between the guider and the OAG body (except the two adjustment flanges between the body and the guider "cup").
Anyway, this is the current set up for people's information.
Cheers
Bo
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