has anyone fit the powerflex lower engine mount pff60 820. would you recommend it or does anyone think im wasting money. i had new flexis welded in 12 months ago and never want to do them again so im thinking the bush should stop the engine moving thus protect the flexis from going. ive already done the the top engine mount so i can cope with vibrations. does the bottom mount make the vibrations any worse. cheers for any advice.