OK, mayby I got yer wrong - maybe it's a different "torsion bar" setup,
quite common on trailers in New Zealand - they're called Duro-Torque
(made by Trojan I think) - and work like this...

Two square hollow bars (square tubes), one is smaller and inserted into
the other at a 45 degree offset. And set into the "gaps" - are big
rubber bits.

These are fixed, by way of the way they're contructed. Their downfall
is, that when the turn round to a point, they basically roll round and
fail . The only fix is usually to replace the rubber (and they're damn
hard to seperate the two box pieces, given the rubber jammed in there.

I'd find out who makes them, or who can service them, and see if you can
get 'em reconditioned, or replaced - typically not very expensive.

--
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