Fan Blade Clearance?

[burly]

After switching to an Offy regular dual intake on my 39 Standard I've noticed my generator mounted fan blades just barely clears the bottom of the top tank of the radiator that extends back over the fan on the 1937 - 39 standard models and that's before tightening the belt. Just wondered if any of you guys may have run into a similar problem. I'd considered take some material of the tips of the blades? Thanks fellas!