Grommets fine, though a bit sloppy after 2 weeks of heavy vaping. Definitely inside the tube. Used shrink wrap to cover middle 2/3 of center post and continuity gone. Recoiled, reading 1.4 ohms and fires fine. Going to look for a PTFE tube to replace grommets and insure no contact in tube going forward. Shrink wrap will work, but looking for a less cludgey solution and I'll do all three of my DUDs.
Hey brother, if you have a Fry's Electronics near you they have some thin wall PTFE tubing assortment packs the have a few pieces of a few different diameters for around $3. Can't seem to find it on their website but I no for a fact it's in the store.
If you can't find any easily just lemme know and I can just send you some.

........rubber side down
