Very helpful link to Matts Classic cameras BUT the other link did not work -- I have taken off the base-plate of my FTBn cameras and lubed the cogs and pivots -- I put a drop of oil into a dish and pick up a minute amount on the end of a piece of fuse=wire and touch the cogs and things and it works well. Americans seem to mention 'Windex' to clean out the old foam -- never heard of it in England and we do not have those 'Walmart 'stores either.