I work quite a bit with air bearings. There is an inverse relationship with pressure requirements and tolerances. If you want low pressures, you need high toler

I work quite a bit with air bearings. There is an inverse relationship with pressure requirements and tolerances. If you want low pressures, you need high tolerances...if you want low tolerances, you need high pressures. There was some fundamental math that could have refuted this idea from the very beginning, but Musk spoke before he calculated.