How big is the difference ?.

[rchippie]

Originally Posted by Sylvester

You can feel the quality difference in your hand ; it will run cooler and will have more power. The 1940's are comparable to size with the XL's ~ the 1950's are a bit longer than the XL's.

I sure the qualitly is better, i was really looking for a somewhat detailed performance report if thats possible . also are the endbells screwed on or do i need a clamp ?.