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Reading the message my understanding is you want to guide manually with a Mk1 eyeball.
Using an off axis guider on longer focal lengths i.e. SCT's etc will give the best results - every time.
In the bad ol' days we used manual guiding all the time and with some success. The real problem is being able to magnify the guide star in a cross wire eyepiece such that you can see the corrections needed and click the controller to make them happen.
Our rule of thumb was we had to guide at x3 the focal length of the scope!! This usually meant adding a x3 barlow lens to the guide tube. You used to be able to buy a x3 barlow fitted in a diagonal especially for manual guiding. Lumicon used to sell them.
Having said all that, IMHO the way to go nowadays is with an off-axis guider and a small (QHY5) guide camera - much easier!!
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