I feel like I'm the only one using silicone with my nano! All you guys are havin troubles with all this glass and I'm sittin here havin fun choppin up new "bowls" out of everything! Right now my favorite is about 2 inches of UD thick silicone( have found it to seal better than the thin stuff Andy sends) and a 14mm whip adapter shoved in the other end. Lots of room between herb and heater so the hits are just as smooth as the glass bowls Andy offers. I also made a micro hit bowl. All I did was take a coned shaped bowl and stuffed 1cm of silicone inside of it, but the silicone has a triangular slit halfway up it. This lets it cone into the shape of the bowl. So it goes from 3/8 to about a 1/4 where your herbs are, now that's my conserving bowl and kief bowl.
I want to try the silicon, It makes a more airtight seal i bet,
therefore probably fatter milkier hits?