@Shit Snacks -
Here is my latest 18mm GonG tube. I fused a 13mm plain end tube to an 18mm GonG fitting. Have been wanting to make them for a while now. Surprised how well it worked considering I don't have a glass turning lathe. They were made on my metal turning lathe. I'm planning to charge $15 for them. Will work on all the brands of log style vaporizers.
You never cease to amaze Alan!