If you've read my other threads you will know that my MBX surface prep tool went from useless to very useful when I ditched my Sealey air regulator and fitted a decent Metalworks/Devilbiss regulator. And now my other tools are also totally different tools. So it's not just PSI that matters, it's airflow. The Sealey regulator must have been throttling down the airflow. Someone just suggested to help further to replace the quick release fittings with ones that don't have the automatic flow stoppers in them. But can't find any. I'm using the high flow Euro type. I was going to put ball valves behind them. Anyone know a brand of euro fittings that don't have the auto shutoff? My die grinder now is also working properly and grinds away metal instead of just grinding itself away and costing me a fortune in bits.