OK I'm going to sound dumb. Can you put a sub ohm tank like a u well crown on a tube mod. Are mech mods only for rebuilding. I've been vaping for 2 years and am prefectly happy with my vape lifestyle.. make my own juice and I'm regularly srock piled. but I'm confused.
Going to get blasted, but...
1) Know your battery safety and Ohm's Law as far as what limits you will be asking of your batteries on any mech setup, 4.2v fresh charge/0.5ohm coil head=8.4amps (Voltage/Resistance=Amps)
2) Do not use the tank on a mech that does not have an adjustment pin on the top cap, examples do not use it with a SMPL or Tugboat Tube mod (faux hybrid direct to battery positive connection), but a mod like the Nemesis which has an adjustable positive center pin is, alright, in a sense
3) Continually inspect the 510 connection on the base of the tank, as the insulator ages due to age it shrinks and deteriorates, thus the positive pin will gradually recess further and further, if it becomes flush with the threads and/or recesses into the thread housing, try to replace the insulator or replace the whole tank entirely.
4) 20amp CDR batteries I would run the highest Ohm coil heads the uwell has 0.4 to 0.5ohm ideally. 30amp CDR batteries you could probably get away with using the 0.25 coils (4.2v/0.25ohms=16.8amps), this gives safety headroom in case of an "UHOH" moment as well as safety buffer of battery age, new battery has full mah and CDR, battery that has been heavily abused and pushed to its limits daily 6months down the road could potentially only output half its CDR and have half its mah.