I used a plastic lawn mower blade balancer to touch up the blades on my fan. Even with this cheap setup I can't detect any fan wobble or wiggle. Still, to be safe, when I get a chance I'll look for a fan that fits without cutting. I get good cooling with this fan mounted about 2" from the radiator and no shroud, except when the air temp goes over 90. Not good enough for hot summer wheelin' so a shroud is on my hit list.