would it be too hard to put a slight angle on the axle splines going into the spider gears? You'd have to have the splines recut to their original depth,but i got a company called graden gears here in sydney to increase the depth of the splines on a part from a gearbox & it cost bugger all. Even if you had to heat treat the splines again, any competant spring maker should be able to do this. I mean they were making leaf springs for a motorbike on American Chopper the other day & the heat treatmeat was simply cooling the heated spring in an oil bath.you could then bend the housing in a press & not wear out spider gears & axle splines.