The word "linkage" refers to a connection or relationship between two or more things. It signifies how different elements or ideas are related or connected to each other. Full definition
This level of linkage between in - session process and rigorous outcome measurement is unusual in the field of psychotherapy. (coloradoeft.com)
(d) capacity to be developed and utilised as a service hub (including transport) with linkages with smaller communities / homelands; and (humanrights.gov.au)
You would also need to check the mechanical condition of linkages for damage or seizure due to ageing or obstruction as well as the locks. (mechanics.stackexchange.com)