A tiny tweak to the size of a frame piece. I wanted a snugger ankle because I found my Dummies' feet were falling off after only a few days of fiddling around with standing poses. Now much less likely to lose a foot. 

Note 1: if it's hard to fit, place the foot and ankle upside down and press—much nicer to fingers. 

Note 2: really, really doesn't want to come out once it goes in. Make sure you've got the right color/orientation before snapping it in place.