I have 16mm coils and a PID. What should I get? Will it be very difficult to install the coil to the heater? I want glass screen right?
They are hand blown so there is variability between glass heaters, so your coil might be nice and snug out of the box- more likely it will need some adjustments. My original boro heater was slightly too big and coil wouldn't fit, my quartz was slightly too small and rattled around loosely. Rather than try to muscle the coil I wrapped the bottom section of the glass heater with stainless wire, to make it nice and firm without fear of cracking glass.
If you do have to adjust the coil you want a vice and adjustable pliers (multigrips) and a strong arm. Wrap the pliers in tape to protect the coil surface. Start from the first coil and work out. The better the contact the better you can transfer the heat.
You don't have to use the glass screen but I prefer it. The standard mesh screen is easier to clean and keeps your rig cleaner as well, but can't beat all glass flavour. The all glass kit still has stainless mesh screen in the heater which you need, to keep the balls up there. I removed mine from my torch boro heater for the all glass experience, with enail and balls that isn't possible.
You definitely want glass or ruby balls, it doesn't hold enough heat calories without them, need to run very hot and wait too long between hits.
I found the 4mm ruby terp pearls were not able to fit between the dimples, so I didn't need a screen in top hole, but could only half fill with balls. But it covers the area where the coil sits and works great. Recovery time between hits is probably slower than if fully filled with 3mm balls. I can still hit back to back no problem, but just go a little slower subsequent draws.
It's not hard at all, so strap in and enjoy the elev8r ride to the top.