I just took a look at my SSP and you might consider keeping the flame king. I’m in the same situation as you and have a 5lb flame king tank from another grill waiting in the wings for when I empty my original Manchester tank.
My solution will be to take a one inch length of 1/2” PEX, cut a slit and place into mounting hole on the FK tank to stabilize the tank. You will need to modify the mount to accommodate the much narrower mounting hole though…
My solution will be to take a one inch length of 1/2” PEX, cut a slit and place into mounting hole on the FK tank to stabilize the tank. You will need to modify the mount to accommodate the much narrower mounting hole though…