RE:Cracking head section on Cortland QD 325 line?
Very late into this discussion but...
I cracked the connection of lead head to running line in an orvis depth charge 7 wt. a couple years ago on a very cold day at Scortons--a tiny amount of epoxy and I have gotten two more seasons out of that line with out issue.
I cracked the hell out of the running line of the same line in 10 wt. variety after a tangle formed, which ruined the line. i swore i'd go with Airflo after that for their 5 yr. no crack guaranty, but Orvis replaced for free.
Dryness has seemed to be the culprit both times--either cold dry or hot dried out line sitting on a boat deck...