all the threads are same and x-fit
but when you switch, look at how the silicone cup of the coil does not 'mate' up
with the air tube inside...
I think the issue OP is asking is OP has an older MT3 (not MT3S)
which has the combo coil/base
and asking how, will, can he switch to replaceable coils
this might be what will fix what is asked if I got it straight...
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Kanger MT3s Base Replacement