Sears canister vacuum – hose swivel replacement- release conn.

\015 The power head runs intermittenly; seems to be related to swivel connection. bought new swivel but can’t figure out to release the hose collar from the swivel. is there a trick or a tool that’s needed? the only manual i have is the parts manual, is there a repair manual also?\015 – Kenmore 23913 Progressive PowerMate Bagged Canister Vacuum