TOPIC: Loose drain plug tube

The drain plug tube on my 1966 Crestliner Del Rio is somewhat loose. I can spin it with my finger,not very easily but it can be spun. Should I recrimp it then seal it or just seal it? The transom in this boat is rock solid and I dont want water to leak past the drain tube. Its just the factory tube rolled over on each end.My impromptu crimp tool would be something like whats pictured....Thanks for any advise, Rob