In one of the books I was reading something about the procedures which were necessary that such a mortar is ready for a bombing.
Defintely it was not a fast activity in a hurry!
In order to place the ship at the correct location for firing the bombs they had to install the anchors at a correct place - minimum two or maybe up to four anchors had to be placed. This will take already some hours of work.
Than the mortars - these covers were heavy and I am not sure that the seamen were able to lift them by hand - they are 2m *2m -> I calculated appr. 0,35 m³ wood - when the cover was made by oak it would weigh appr. 200kg - with some nails plus iron rings let us talk about 250kg
So I guess they had to handle these covers by lifting tackles with their spars.
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A bombardement lasted several weeks or also months, so I think they also stored these covers and all other stuff they did not need on the storeship which was also responsible for transporting the additional shells, the powder etc.
I think they dismantled these parts and brought them to the other ship....... I will try to find the book in which the procedure is described..... somewhere it is written