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That is correct, some of the astig comes from the droopy prism, and it can be improved by adjustment.
It is quite a sloppy mechanism though.
The only real problem with using the GSO focuser is getting the tube to unscrew from the black box in the first place, it is doused in threadlok, the red variety, so you need two Boa Constrictors to be able to unscrew it and it takes an obscene amount of force to do so.
It is best to remove the rubber etalon adjustment collar first (it just peels off) and remove the locking screw in the collar underneath before attempting this, otherwise you can shear off the locking screw.
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