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@number6
firstly cups are not cottered and not-cottered - that's only the BB spindle- get an old style (non-cartridge) BB that takes cotterless cranks and you can leave the 'fixed' cup in situ (wheter it's cross threaded or not )....and fit the spindle that takes cotterless cranks
eg: moving from
http://images.andale.com/f2/115/106/3561856/2006/11/30/chater_lea_bb.jpg
to
http://commons.wikimedia.org/wiki/File:Cup_and_cone_bottom_bracket.jpg
notice the difference is on the ends but the cones are the same for both spindles ('axles')
this latter pic shows older style with male thread on the axle whcih takes nuts on - but you can get some with female thread in the axle to take bolts in aswell it'll make no difference.
by fixed i'm guessing he means the drive side which on older BBs is hard to get out and so often remains in there - it's not 'fixed' as such.
check out the BB removal tool on sheldon brown before shelling out on LBS
ask him how he knows it's cross threaded.. can he see some BB cup thread? probably not - does he know whether it's Italian ?- probably not . although even the correct thread in the correct side can go in at the wrong angle in which case you'll need to remove it if he tells you the BB cup is not sqaure to the BB shell on the bike - it will need to come out. if it is square ask him A) to leave it in and replace the axle for a cotterless one and B) why he didn't know to do that without you having to tell him.....
home made BB removal tool
http://www.sheldonbrown.com/tooltips/bbcups.html
use a very aggressive thread. the bolt should look as rugged as a wheel nut for a car if you use something that looks a bit like a bike axle thread you'll strip it. mine has never ever failed to get one out - and if the thread is fucked - all is not lost - get a thread-less BB in there.