Hey Everyone! I am back, and back to the grind, refreshed!
About the glass stems. The glass is SIMAX brand by
Kavalier, a high quality European glass producer.
They are 14mm Outside Diameter, with a tolerance range of +- 0.18mm on the diameter. So 13.85mm, or 13.9mm are within spec.
All glass will have a tolerance range for the outside diameter. Depending on the source of your glass tubing, you may find that 14mm tubing can be anywhere between 13.5mm and 14.5mm depending on the tolerance range deemed acceptable by that glass producer.
Any additional processing that you do to glass will have an effect on the size. It's difficult to achieve perfect size when you're working with hot glass tube.
A glass stem with an integrated glass screen will have gone through an additional hot working step in order to fuse the two glass components into one. This extra step will add more variations to the outside diameter. So, I have been hesitant about sourcing such a stem for the Nomad. Those with Arizer stems will know that their stems can exhibit a pretty large range of sizes... and either fit loose or tight in the same device.
Some people will find that an Arizer style stem will fit the Nomad, while others might find that they don't. It really depends on the stem itself.
Going back to whether or not this or that stem will fit inside the Nomad... well, it's really a crapshoot. In theory, any 14mm diameter tube should fit. But in reality, it may not.
To add to the confusion, A glass straight stem, with a 14 taper fused onto the end of it, does not necessarily have a 14mm outside diameter for the straight segment of the glass tube. Again, this depends on the original manufacturer.
Another point of note is wall thickness. A 14 taper will most likely be fused to a straight glass segment that has a 2mm thick wall. I use 1.5mm thick wall tube for the stock Nomad stem. Giving an herb chamber diameter of 11mm on the inside. With a taper joint stem, you'd most likely be looking at a 10mm herb chamber diameter on the inside, so... a smaller bowl.
A better solution for adapting the Nomad to watertools is to make a wood or Delrin adapter that fits into the stock glass stems. That way we can keep the original 11mm inside diameter for the herb chamber, and we don't need to worry about the difficulty in manufacturing an all glass stem + taper joint in one.
This way you can have....say.. 5 stock stems... and two adapters, one for 14 taper and one for 18 taper.
The cost would most likely even out.
About the button springs. I found some suitable springs, one gives 30% reduction in spring pressure, and one gives 70% reduction. So that should cover a range. Hard (stock spring), Medium, and Soft.
I will make the new springs available once I give them a little testing. Should be fine.