Thanks, logwalker

Here's the damage I did with it


Check out the two pieces of 3/8 wall channel that were under the jack and over the chain !!!
Bent it a tiny bit. Steel was too damaged to try any harder

There is a little wear on the shaft so I thought maybe I could shim the bearings with this really thin 'spring copper" stuff I found in a workshop drawer. You can see it under the washer at the back of the shaft. It looks like copper but has a definate set to it ? It's thinner than a line on my cheapo calipers

I'm hoping that between the tiny bit of straightening and jamming the bearings into line with the shaft shims that it will be straight enough. Maybe I'm just dreaming with those shaft shims, though

Also included in the picture is the bogey assembly that fits on to this shaft and has a wheel axle on it.