As long as you're making tools with the convenient/comfortable wood handle, you should look into making one that is a thin-hollow tube for setting the x-ring in your non-Omni Dynavap vaporizers, for those that want to move the ring down further to partially, or fully, close off the airflow from the carb-hole.
I am hoping to make more types of inside tools
The next one up is a x ring remover you know, you push your condenser out ,but an xring has failed to remain in its grooves and is stuck inside the stem. I have 7mm 6061 aluminum bar which can be cut to length and a hice little handle on the end
regarding your idea of a x ring mover to close off the carb....doesnt that involve moving the ribg down the stem toward the tip? As that means pushing from the mouthpiec end and there is an xring in the way, youd need to take the condensor out, or at least remove the the mouthpiece xring to get to the ibterior x ring.......what you are looking for is an x ring puller...inserted from the tip end and pulling the inside x ring towards you. Even if that were possible, youd need to remove the condensor to reset it anyway
------
I do have some stems about finished that have a default closed carbhole. I have moved the carb up towards the mouth end...when the xring is in its groove, the carb is closed. An x ring pusher would work in this design, as you could open the carb by pushing the tool from the tip end.
Then...it is amater of ibdibg a hollow tube with the tolarances needed, as dab8 mentioned...would need an ID greater than 5mm and an OD of less than 7mm I did a quick ebay search...china supplier may have something but its 22$?a foot snd tolarances are .5 mm so its a turkey shoot as to whether youd get a tube the right size
If there is interest in my x ring remover Inside Tool, let me know