I do this, works great as it allows it to meter out the powder more evenly, without a large clump falling out and putting you over your intended weight.
I use a McDonalds straw. It's a very lose fit, so what I do is dribble some powder through it first (without the staw in), then shove the straw in so some of the powder ends up forced between the outside straw and the inside of the machines original powder tube. This is enough to hold it in place. Hard to explain, but basically the power will hold the straw in place.
Kj
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