HSS 14mm x 1 Metric Die Left Hand Thread M14 x 1mm Pitch https://www.amazon.com/dp/B07BSBT44T/ref=cm_sw_r_cp_api_glc_fabc_Y34Z1CFNNXJKWMZM645C?_encoding=UTF8&psc=1
It’s cheap so go slow and use plenty of lube