I have two of the Jimmy Li 8×11 brass cassettes, and they are absolutely fabulous in using. Sometime they get abused too, but there is no sign on any of them. They will outlive me, for certain.
I noticed they are different: same measurements, so we can get this out of the way. The differences are not affecting their functionality by any means.
So to resume, these are the two cassettes: same materials, same dimensions, same design; however, I guess they are from different batches:
No 1 – grind finished
No2 – machine finished
Same situation on all sides, see here:
No 1 box has felt glued on the bottom of the two halfs, whereas no 2 is plain metal. Same dimensions though.