I use the whole wick when I rework a smoke unit - either Lionel or MTH. Just pack it in so that it does not block the fan "blow hole". I soak the wick with smoke fluid and use a small flat screw drive to work it down in the corners. You will be amazed at the increase in smoke output from just this small action. The above video that GRJ posted also shows some other fairly easy upgrades.
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