Yes, indeed, laypersons are allowed to repose the Blessed Sacrament back in the tabernacle, which involves removing the luna, if there is no priest (or in the case when I had to do it, the priest had had an operation on his hands and was temporarily unable to manage the fiddly little fastenening on the monstrance).
So I presume that they are also allowed to take the luna out of the tabernacle and install it in the monstrance in similar circumstances, as it wouldn’t be logical if one were permitted and the other not.again, with commisioning a lay person can expose and repose.
It’s interesting when some of these threads crop up as it brings out posters who have an almost superstitious attitude towards vessels, and also the area of the sanctuary. It reminds me of that scene in ‘Raiders of the Lost Ark’, when those who touched the Ark were killed by an avenging awfulness coming out of the Ark itself.
Folks, someone has to clean things or repair things or just cope with the problems that crop up from time to time. Yes this is true, but if work is done in the sanctuary, normally the reserved Eucharist is removed from the tabernacle. I mean work, not routine cleaning.Our Lord told us to use the most common foods of the time to remember Him by, He cooked fish for His disciples, He spat on the ground to make a paste to cure the blind man , He allowed all and sundry to touch and jostle Him. I think He knows all about commonsense, I don’t think we should put ourselves in a ‘Raiders of the Losr Ark’ mindset. Reverence, yes, superstitious dread, no.