went on a call today distribution tubes rubbed together and lost the charge it had a hair line crack. i can see it happened in the past on a another set someone used a 1/4'' piece of copper as a coupling. now being that the refrigerant goes through the orifice then through the shower head if it expanded into the little coupling deal. it it a big deal? i just brazed right over my crack with light heat i didnt want the brazing rod to be all watery and go into the crack and clogg up the distibution tube. i guess my question is how is the best way to repair them on a rub through. im sure if it was on cap tube being the metering device them definately you dont want to us some coupling because the ref. will expand inside. looking for some info or maybe im over thinking it.