If it's anything like my old Migtronics than the original torch will be long obsolete, NBC went years ago. I grafted a eurotorch liner in mind as a quick fix but it's ugly! The next time it will get a euro convention.
If it's just a bit of pipe you need then look at hobby might liners.
i have"repaired" with glue, the insulator then put a piece old liner in it to run the wire through it works for now [most of the time ] but i know i need to get a new one.i have measured it. so as a last result i will get one made.