Any suggestions/recommendations? I'm thinking of making a jig to program ESP-12F modules.
Answering my own question: looks as though 1.02mm diameter should work fine.
2.4Ghz RF Module for new users 
DIN Rail LEGO
BBC Micro:bit and MySensors - a great match!
A small NRF24L01 chip comparison
Best options for a low current display for a battery operated node?
AC-DC at own