Thanks everyone for sharing your thoughts and experiences, (especially IanT, Howard Lewis and Oily rag).
Roger – that Angnt info, especially the sectional drawings is very interesting, a high end precision tool. I guess for production work a "floppy" reamer would be far from desirable but manageable in a home workshop.
Anyway, I've now got some fresh ideas regarding making a floating reamer holder for my larger reamers with MT shanks, but I'm going to leave it for a while, need to re-focus on my Lion build.
Cheers
Nigel