Touch hole liners are almost all made from stainless steel, or Inco bronze, both of these materials, while resistant to burnout, are very susceptible to thread galling. Threads in touch hole liners, drums, and breech plugs, should be as close to a full detention thread as possible. Removing, and reinstalling, these items numerous times compromises the threads integrity.
And, as for TC's recommendations, just remember they think coil springs are what is needed in a lock.
Hungry Horse