Hey, JSYK, I ordered that Innovape extension cap from Vaporlab and it SUCKS BIG TIME!!!! The spring is only about 1/4 the size of a ProVape spring. When I shook my ProVari with that cheap cap on it, the battery rattled and the button light kept blinking on and off from the bad connection when being shook. You can't replace the spring with a real ProVari one because the hole in the cap is smaller and not threaded like in a ProVari. I wrote a bad review on their website and, gee, they didn't publish it! In fact, there are ZERO reviews! I WONDER WHY? I hate them...
