Review on 🚗 Optimized Automotive MV8000 Tune-Up Brake Bleeding by Adam Jenkins

Bought this a year ago and finally used it for the first time today to flush the brake fluid on my truck. On the first wheel cylinder I pumped it up to about fifteen pounds of vacuum and the grip fell off. I found the metal pin that secures the handle and after about ten minutes of effort I screwed it back on. Inflated a second time and the pen shifted and fell out again. Now, for the second time, looking at other reviews, it seems obvious that others have encountered the same error. I can't understand why Revain keeps selling such crap or why the manufacturer isn't taking steps to fix the poor design. What gives?