Do you struggle making hollow machine-gun barrels when you can’t find metal tubes or hypodermic needles small enough? Use the plastic handles from cotton swabs. All you have to do is stretch them like sprue. They remain tubular even when stretched to a hypodermic needle’s inside diameter, and can be kept straight by inserting wire into them before gluing them to your model.

Tip submitted by:
Mike ThompsonAmes, Iowa