PS: the link that sisu1a posted...

http://www.dexteraxle.com/torflex_axles

Is exactly what I meant, re Duro-Torque suspension.

And my advice still stands, get 'em serviced (normally replaced as
that's typically the only option) by the maker or agent that can do it.

--
Duncan

In article 3d6a5cbb-6d19-4636-90bf-e56fb1f8a036
@o36g2000yqh.googlegroups.com, says...
I never thought of that. Thanks. But what holds the removable part
into the axle? I can't see anything. I don't see any kind of
setscrew anywhere. The outside end is just the end of a square tube,
and the part attached to the wheel is welded to the torsion element.

Ed

Torson bar suspension is typically adjusted quite easily. The end of the
torsion bar should be splined. *You should be able to take out the bar
with the trailer "de-loaded" (jack the weight off it), and reset it in -
turned around some - and let the weight back on. *Hopefully, you now
have suspension again.

--
Duncan