The torsion tubes are the two bars than run across the front end, between the uprights/shock mounts.
Remove the trailing arms from one front side of the torsion tubes. The trailing arms are the two bars shown n each side, angling off the torsion tubes:
Inside your torsion tubes you will see ends of these:
The most common “softening” mod is to remove the small bars and leave the wide ones.
Former Owner of a 1981 Classic Roadsters Ltd. Duchess (VW)
2005 Intermeccanica Roadster
If you own a TDr and are not in the Registry, please go to https://tdreplica.com/forums/topic/mg-td-replica-registry/ and register (you need to copy and paste the link)