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Iv'e used an 8" reflector for 2 week's straight with no focuser....Just held the EP/s in one hand up to the hole in the tube , & nudged with the other. No probs about not having enough focuser travel, that's for sure lol.
Another time (same scope) I didn't have a diagonal mirror at all, (or the focuser) so I moved the primary up the tube...tilted the primary so the focal point of light was at the very edge of the end of the OTA tube....wacked the EP there....held a mirror to the EP at a 45 deg angle, & peered into the mirror. he-he-he..
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