It was suggested   further below that I purchase a fin straightener  for the aftercooler on my 9650 STS.

This is a new critter to me and I know nothing at all about them.    Does anybody have any advice about what type  is the best to get  and why that is so,  along with tips on how to best use effectively ????

Looks simple enough   but experience can be a hard teacher, and you might be able to save me some grief!