needle collar tighten too much?

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needle collar tighten too much?

itsblue
Hi thanks in advance,  I am rebuilding the carbs and when I tightened the maijn jet housing it pushed the collor up a bit further than prevoius.  The needle bottoms out 1/4 inch before the slide fall all the way down.  Should I sand the needle in that area so the slide goes all the way down, or  use teflon tape and stop when the needle snugs up?(fyi the needle is set in middle notch) running custom velocity stacks and open exhaust stock motor.
Stephen 407.687.8201