I just bought a new trolley jack from Halfords, this one in fact, it's a heavy thing but nice and solid. However, all the jacks I've had or used before have allowed quite sensitive and slow lowering of whatever has been on them, handy for letting axle stands slowly take the strain if you see what I mean. This one is very clumsy though, it just suddenly drops as you slowly unscrew the handle. Should I just put up with this, or is it a dodgy one? Or perhaps can the drop speed be adjusted?