Received the tube in a wooden box that was propped up against the garage door. Was able to disconnect my broken original tube in my Nova51 130 Watt machine and insert this one. It fit so well that it actually didn't even need re-calibrated. Every test was spot on, and the laser was exact in all four corners of the machine table. Fired it up and it works! We did run into the high voltage wire problem where it would ark through our silicone that we had wrapped it up with. We had to triple up our defenses around that spot and ran more tests. Now it works better than ever! Very excited, but not dreading that fateful day for this laser tube to also break. Hopefully I can post an update when it does on this same review so we can have good data here!Until then, iEngraveStuff.com!