[chrisguyw]

I use titanium slotingplus rear axles but am starting to move toward steel hollow instead after I bent a titanium Axle.  BENT!  Much softer than I expected. 

 

If you are set on hollow steel axles, try the ones from Koford,.......KOF-M339, KOF-340,.........these are top quality/precision products, much better than the ones from the plastic car manufacturers.

Cheers
Chris Walker