Thank you, Dave. The museum answered and I could continue, so I finished working drive axles, like Semi Trailer Mechanic. We both think the same way and same time, though I needed more time to make it tidy:First I filled brake chamber mounting holes (consider teir location wrong) and made new ones :
Here is how they should be from Cruiseliner broshure.
I here is how I made camel back suspension. 0,8 styrene strips were used for springs:
Here I cut original suspension for axle brackets and center point hub.
I found Mack Center point suspension on line:
Here is the jig to glue and shape springs:
The idea is: spring ends sit inside brackets free. Pins (marked with red circles) are hold springs in place:
Of course we need working shock absorbers here. So I used brass tubes:
Billets:
Shock absorber: