I use the eleaf ECR rebuildable coil head, which is the same principle as the CLR coil in that the coil legs have to be trapped and isolated by that rubber grommet at positive pin. If the coil legs are too long and the wire too thin you can get a hot leg which will burn the grommet, unless you use NR-R-NR wire coils.
I have this problem with rebuilding protank coils since you have to use a very thin gauge wire and the legs are long. That's one reason why I stocked up on NR-R-NR premade coils from FT.
But I don't get a hot leg with the ECR coil head using 28g wire.
You know, some factory coil heads I've taken apart have the really tiny tubes (silicone?), sleeves around the coil legs. I wonder if plasti-dipping coil legs would work and be safe).
I believe that NR-R-NR wire is critical when rebuilding those older, smaller coils that use very high resistance wire that heat up very quickly and may damage the insulators. Remember burning cartomizers? Thin (32 or 33g) wires, coils wrapped in polyfill, not enough airflow and poor wicking... Newer, much improved coils that use lower resistance wire (28g or so), don't need NR-R-R, IMHO.
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