Rudeboy
Looks like we recieved the GRRT around the same time.

My engine was the same as yours, swarf everywhere and the liner was slightly twisted so that the liners exhaust port did not match up with the port on the case, there is no locating pin only the little slot where there should be one so I used this to my advantage and made a small C-spanner so I could twist it around then I cleaned the whole engine with ethanol, oiled her up and put it back together, also check the needle valve as I also found swarf there.
I don't think you should remove it unless there is a problem, just clean it out.