@primitiveorganic I do not offer carbs on my stems as my drill press is not accurate enough.
I made a condenserless stem ages ago and found the wood leeched oils into the reclaim, since then all my stems have been built with an integral condenser.
I'm not willing to take any chances with my customers health with either oils or dust, especially with species which are known sensitizers.
In the beginning, tips gen1&2, carbs were necessary to take advantage of the venturi effect. The draw restriction was high and the drop in pressure behind the load helped a lot with achieving big clouds without feeling like sucking a ball thru a straw.
Since then the tips have been rifled more and many people no longer feel the need for carbs. It's a long thread but hidden away in it you'll find carbs either taped up or X rings placed in front of them which either totally or partially blocks the flow thru them.
Some people still prefer them so if you builds allow for it then it's worth offering the option.