backlash is inportant no matter what your installing. but if its a mini you shouldnt change your gear position, like said above. if its a full spool and you dont move your pinion, if you put everything back the way you found it is should be good, run a little pinion primer on the ring gear and rotate it just to make sure you still have a good pattern. If you changed your r n p at the same time you installed your spool you will have to do a complete set up. good luck.
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