Every new RDA I've seen reviews on lately seems to have nice big post holes. E.g. Twisted Messes 2 has 2.8mm ones... and the excellent Tobeco clone is only $16. I know I keep recommending that one, cause I've been so very pleased with mine. It's literally the same as the $70 Wismec version, except you don't get the second outer ACR or the little hex driver, (an Allen wrench is still included).