I checked the tube and the 510 was loose, gasket was old and deteriorated
It is a known issue that some attys can be screwed down too far into the pressed fitting damaging the gasket. Case in point, and I have the proof, is a not very old Coopervien VVG, from classies, that an ERA ver1 was used on without taking precaution to "lift" the overly long ERA threaded portion with an o-ring. (Seller disclosed this to me before purchase.) It's going into spa for button upgrade and rebuild. Luckily, I learned about the too long post and started using an o-ring to prevent damage when I first got my ver 1 ERAs. So age is not necessarily the only factor. And opposite "case in point," I'm currently using a Mini 1.0, relatively early release, with original skinny tube, used virtually constantly for well over two years. Not one leak or any sign of gasket wear or skinny tube breakdown. I'm going to be p i s s y here...... Just what does cause a tube to split? How come I've never had it happen? Very few peeps have been using REOs longer than I have. BTW.... the REO I dug the "packing" out of, by mistake, to do a rebuild, was one DH used for a long while and I know he was cranking the cartos down too hard and it was leaking at gasket but the damn skinny tube was fine. Also, he carried it in carry on bag, as spare, for a year, with long carto attached, crammed down amongst lots of stuff; lots of stresses on that fitting for months. Without leaking for months, and unused, all of a sudden it started leaking in the baggie.
Feisty Alice