I have been building both Rta's and Rda's for a few months now but i just can not rebuild those kanger coils...I still use a few aerotanks and a aerotank mega, the price of buying the coils is kind of outweighing the ease of use as of late. If i remember correctly someone in the NT family is a pro at rebuilding these but i can not remember who?! I would glad ship whoever this pro is a bag of cleaned but rather burnt out coils to be rebuilt. If this elusive person steps forward just let me know the cost or what you would want in trade?!