I recently acquired a rear wheel that I'm having some issues with. The axle has a sort of metal sheathing on the inner part of the rod, where they, and the dropouts touch (see attached photo). I think those are called spacers, but I'm not positive. Is it possible to get those off and maybe switch them to...smaller ones? I really have no experience with this, please help! The problem appears to be the width of the dropouts, they're too small to accomodate the axle or the axle spacers. This is also odd because the axle goes in slightly, but won't budge after a certain point (see photo). I did a quick search and saw that someone had had the same problem with the same wheel, and that they had filled down the dropouts a little so the axle would fit. My question is , if I file the dropouts down, will they be too wide for other wheels? I don't want to file them down just for this wheel, and never be able to use any other again because they'd betoo wide for other axles.
EDIT: On closer inspection, and after taking off the end cap, it looks like the "sheathing" is actually a part of the axle. This leads me to believe that the axle itself has a spacing which is too wide for my dropouts. Would I replace the axle then?
EDIT: Added another photo with the end cap off to better illustrate the issue: http://i.imgur.com/SGejq.jpg