Synchro Ring Clearances

[35ragtop]

Hi Guys,
I'm searching for a noise in my 3 speed transmission and have found that the brass synchro rings seam to have excessive clearance between the neighbouring gear.
The front ring (1.) has .0935" and the rear (2) has .0755"

Is this adjustable? I cant seam to find any reference to it in Mac VP's wonderful book so it may not be an issue. I can easily move them with my finger.

Any suggestions appreciated.