I feel the need to chime in again!!
If the dog has been properly introduced to this criticle stage of his training,
and IF the proper use of FORCE was instilled, then the use of any gasket material is useless.
I have found in extream cases that a small "bead" of Silicone applied directly to the reamed area can be of some help.
I would have to caution though that this proceedure is very unpleasent! Practice can help by using a fresh green grape as the application surface!!
I have also found that the Feathered Fowl may at some time become quite vocal!! Be prepared for this!! Not a good time to slip with the reamer. Damage to the "SEAT" will result, nulifying any progress made during training.
Again. If ANY of you need more specific details of the proceedure please feel free to ask!!