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Something for you to check prior to doing a star test, some of the older model Taks were susceptible to vibration causing the collimating screws on the lens cell to loosen and the lens cell to move slightly and flop.
Can you check and eliminate that, unscrew the Dew Shield and see if the black lens cell will move against the push/pull screws by using your hands (without touching the objective of course).
One less thing to be concerned about...
Cheers
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