[Leica] DR Summi.on M6 / Where in archives? Help

[MGMcGough@aol.com]

 Not knowing which issues to request from archives and in no
 position to D/L all 60MB, will someone please tell me what the
 concensus and conclusion was inre why some DRs will work 
 on some M6s & not on others. Is it because of the 2 variations
 of the spectacles or in the shrouding of the eary & later M6s ?
 I would also appreciate it if someone would tell me which of
 the digests discussed this topic.

 Mary G. McGough