Originally Posted by
phabib
If you're looking at a collar right near the bearing that has a threaded hole with a setscrew and another hole about 1/4 of the way around you've found the locking collar.
To remove those you leave the chains or or otherwise prevent the axle from turning then you stick a punch into the unthreaded hold and you smack it, usually opposite the direction the axle turns. You don't want to put the punch into the threaded hole since that will ruin it. If it doesn't move you can try turning it the other direction.
What that locking collar does is fit with the bearing in such a way that when you fit it over the bearing and turn it to lock it in place it wedges with the bearing and keeps the axle from moving. The setscrews doesn't really hold the axle in place, it just keeps the collar, which holds the axle, from moving.
As for cutting axles, when I cut mine out I used a recip saw (Sawzall) with a 12 TPI metal cutting blade. I got the fanciest bi-metal, coated blade they had at Lowes. It took 8 blades to cut 6 axles.