Those connectors are good and you put the wire through the connector then solder on the terminal, pulling the terminal back into the housing. Therefore you dont need heat shrink for these

The downside of these connectors is that they are quite long and a very tight fit. Therefore they are not a good pick for a removeable link. (the arena isnt well lit where you put your feather into and there isnt masses of time to fiddle about with an awkward connector)