The fixed ground glass has two leaf springs below it to keep it in position, one spring at the front and other at the back, when you adjust the four screws the leaf springs maintain the ground glass right position. During the assembly, the ground glass matt side must point to the finder lens. BTW, Maxwell screens and similars have a different adjustment and it seems this is your problem, for some reason I heard these screens need a technician to be installed, perhaps you need a technician to re-install the original focusing screen again. Carlos > Hello RUG, > I've tired of my Maxwell screen - too distracting for composition, and I'm > replacing it with the original ground glass. > I just compared focus of the ground glass, vs. the Plate Adapter's ground > glass (taking lens), and they're not in sync. > They're not far off, but enough I believe to make critical focus a problem. > Is a little difference to be expected, or am I missing something in my > installation? > I put the ground glass in ground side down (towards the mirror). No shims. > Is this a matter of shimming the GS, or is is a lens adjustment (beyond my > abilities). > Thanks, > Elias > --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at //www.freelists.org/archives/rollei_list