Tube mods are very unstable. I hate that, so I shrink my Vamo and I love it that way!
perhaps some build details are possible ??
THE MORTAR........ Solid Brass construction with copper post contacts.just pure raw power !!!!
Ok, that is officially Bad ....
I would really appreciate a copy of that PDF when you get it done.
Other than being a PIA to change the batt, I love it.