Caravan door pop rivets?

Help please ....
Avondale 550/4 (2002) caravan main door very stiff.
WD40 or 3-in-1 oil does not help.
Apparently need to drill out pop rivets, remove hinges, very lightly drill out the plastic/nylon holders then replace hinges with new pop rivets.

QUESTON: Does this sound right, and are these pop rivets a standard size? If so what size are they?