Most of the DIY yarn swift projects I saw required a large umbrella, computer chair, or making something from scratch. O_O Crap, I'm an electrical engineer, not mechanical! Luckily, I found the best Tinkertoys yarn swift ever! You can even use different lengths for the legs to ensure a tight fit for the hank.
Check out my beautiful center-pull ball of yarn! I'm so picking up my own $15 bucket of Tinkertoys next time (my nephews graciously lent me this set).