My son in law is a Master Tool and Die worker and I use his pin gauges with my jet drills to back up the sizse , if it's .0002 on then for a run down 1320' then it will be OK. Drilled many NOS pills over the pass years and no problems with these jet drills that come in 41 sizes and are not cheap to buy. These jet drill come with there own handels for easy finger drilling into brass jets.
POPS BK911
