Originally Posted by Khelina
If it's too big to fit over that nut on the downstem you guys talk about, take some scissors or a knife and make a small cut on both sides, I had to do it on mine. Works like a charm.
Link with photoes and a better description than mine:
Nice! I did this when I got my diffuser. I didn't know that there was a guide to it! That is all that I did too.