I do remove my touch hole liners at least occasionally when cleaning my gun barrels. I also recommend the use of an "anti-seize" compound on the threads when reinstalling it. That way if you actually HAVE TO remove it to deal with a dry-ball or other issue, it will come out without damage. Using a flushing tube that screws into the touch hole threads also allows me to clean guns with pinned barrels with no danger of getting water or solvents between the forearm wood and the barrel. A threaded touch hole liner that is removable is a real advantage for those of us who are less than HC.
I got the TOW flush kit but it does not thread into the touch hole. The rubber o-ring provides the seal; which does not work because it will not squeeze down into the slots on the liner.
Where did you get a flush kit that threads into the touch hole? Inquiring minds want to know