A prominent Chabad rabbi here asked me the following two questions, both of which I need the advice of Reb Moshe or anyone else for that matter who may be able to shed some light on the following:
1) A door which is a secondary external door - it is not the front door per se but is a main door of a building leading to a parking lot which on weekdays is probably used more than the front door as an entrance - should we follow heker tzir or yemin haknisah? I know this is a machlokes in chabad but what do we do lemaasseh in this case particulalry.
2) There seems to be a minhag in Chabad which was more common 40 years ago and less common today - to put a mezuzah in a paper or thin plastic wrapping directly onto the door. (The idea of see through coverings comes from the Remah, I do not think it is relevant to this discussion). I know that Chabad's philosophy was always to use simple cases because the main hiddur should be the actual mezuzah klaf and not the case. however today we have simple plastic cases which in actual fact protect the mezzuah better as it does not get squashed.
Is the minhag just to have simple cases (in which todays's hard simple cases suffice) or is ther esomething about the paper, thin plastic where you can actually feel the mezuzah klaf?