4x8x4 wheels on my Bachmann 5301 fall off can they be glued to the gears. I tried to ask if they can be replaced and never got a answer. and what kind of glue can be used. I was thinking type of glue you mix.

I picked up two 5301 Bachmann and both center plastic rods that hold the wheels tight are worn out. tried super glue etc and still won't hold tight. is there replacement parts for these