There were a few comments on why a change of only 1/8 of an inch might matter so I thought I'd post a couple pictures...
the JB on the left is the new device that has a cage of:
1 3/4 cage length
1 1/8 cage diameter
the JB on the right is the old (actually it's new also since I only had it for a couple days):
1 3/4 cage length
1 cage diameter




The new device seems to be just a touch longer and this might be caused from the larger inside diameter.
One eight of an inch has made a large difference in comfort... if your using the sizing rings its important to think about the difference of the rings fitting. I can place a 1 inch ring on easily and originally thought that is what I wanted, but with the device you want the ring just touching, not wrapped on and gripping... if you catch my drift.