the chuff is caused primarely by a spring steel plate with a punched hole in it that is just in front of the smoke chamber. To remove it, take the top off the smoke unit (to do this properly, unsolder the wires and unwind the heating element wire that is wrapped around each soldering tab so the heating element can stay inside the smoke unit untouched) now you can pry the black plate straight up. Reassemble the top, you should now have a non-choo-choo smoke unit that still puffs the smoke out of the stack.
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