The brass sleeve adds more weight to the pen but the whole pen is not well balanced IMO. Much top heavy and I have problem writing with it for more than ~15 min. Otherwise, I like the pen, its size and writing performance. It would be sin not to use it frequently.
I have successfully removed similar sleeve from the Phileas (actually 3 of them) and it hasn't been too difficult. All you have to do is to unscrew the blind cap, insert something like old style thin metal BP refill and push the round side of the refill, pressing the sleeve down. Because the sleeve is stucked you have to push hard (but carefully) and once the sleeve starts to move it drops out easily. Just be careful not to damage (too much of) plastic barrel of the Phileas. Now I can use non-WM carts with my Phileas(es).
But the sleeve in the Expert II is attached to the top of the barrel ( the part with the small metal ring). I tried various techniques (not all of them are for sensitive hearts)
I thought some of the good people here could give the definitive answer to my question. TIA
Cheers!