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After you have got focus using a Hartman Mask or software etc, try a couple of eyepieces in your focused position and try to get one parfocal or if it is just out, use a parfocal ring and draw a pencil line on the refractor focuser.
Will save you trying to find focus if you remover the quider and use the refractor for visual or whatever. Whenever you put the guider back in, just use the parfocal eyepiece first and get focus, then put your guider in and your away. You can also use the eyepiece to find a suitable guidestar as well.
Cheers
JohnG
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