Paul,
Thanks for sharing, maybe a bit of "chinese precision", both my F50M & F60M are not affected - as yet.
I agree like Williams Optics etc., these are not products to butcher!
Perhaps the main offender is the mass of the Rigal pulse illuminator - but I doubt you will bin that unit!
Since you have dismembered this beautiful object, suggest applying silicone grease (Dow Corning DC- 4 is the aviation version). Its a bit like Vasolene, but slicker and never dries out. MDS:
http://www.dowcorning.com/applicatio...OD&country=AUS
BTW this is the best electrical moisture barrier bar none!
David