General contractor used from homeowner to maintain client’s property contacted us after a cracked pane on a custom built skylight from a out of business manufacture many years ago. We had Arthur asses and measure the glass pane and  special ordered  through our glass supplier. After a long wait we were able to schedule a date for replacement. It takes care and some skills to remove metal flashing and sealants. Installation is normally easy by putting back flashing and screws and resealing joints with high grade sealant.