You know Basil I have talked to a couple of people about this and I dont think its really a good idea. Put glass on the liquid tank part and use metal or some other material that is easier to work with for the top chamber (if I am thinking about the right kind of device there). Part of my reasoning is because of the difficulty of making such a small hole in glass and the other part is because how difficult it would be for the end user to make an adjustment if the draw was not right for them.
You know I am always up for fitting glass to something new but I also want to make sure I am offering folks things that would be good value for them. Convince me if I am wrong on this, I can be hard headed but I can also be swayed by good sense.
Good to hear the new tank came in, you have the washers with this one so maybe it will fair better in a tumble. The Mrs has dropped her go tank twice this week. First time it broke the carto and acrylic drip tip and left the tank unscathed. Second time it cracked the tank but its still together and not leaking. She is gonna use it till it gives up

One more drop and its prolly done.
Dont know if you caught BLKs recounting of the abuse his first skull tank went through but it was a couple of pretty rough tumbles and its still going strong even with a broken carto and trashed drip tip along with a few new scars on a SS mod. I have been quite impressed, stuff happens and thats just the way it is but these tubes are tough.