The change to the 18 point mirror cell on Meade 16" LB happened in about September of last year.
The black tube rings on the GSO only within the last month as production started.
The new bearing can be adjusted up and down the tube but from the technical diagrams looks like a fiddly procedure using screwdrivers with the scope off the mount.
The new bearing incorporates a brake system. This will probably become standard on all GSO Dobsonians down the track to do away with having to pull down stiff springs.
....Although this has been the longest running telescope launch in memory I think it will be overshadowed by the announcement of the GSO Ritchey Chretien OTAs next month!
.....Watch this space.
Michael from Bintel