If you mean there's 2mm between the record and the bottom corner of the dust shield, that's plenty. I have a 901 and am currently breaking in a friend's 901 while he's on holiday. Neither one has any more clearance than that, probably less.
If you really meant 2mm from record to cartridge body then something's seriously wrong.
If you really meant 2mm from record to cartridge body then something's seriously wrong.