I just got done replacing the axle flange bearings on my Craftsman model 247.88691 26" snowblower. Unit is 11 years old and getting wheels off was a bear. After getting it all back together, I got to thinking, what keeps the axles from sliding out? As you can see this has 2 axles. 13 is the flange bearing. 69 is a spacer. 12 is a gear that slides on over key and does not have a setscrew. 24 is a spacer. 22 is a spacer. The axles each go into 9 which is a loose fitting metal tube. Other axle is the same. I can't see anything that would keep the axles from pulling out. Any ideas out there? Thanks for taking a look.