[RainyEyes]

I'm no expert, but I don't think this would make too much difference in terms of heating. Unless you're running a ridiculous spring, the heat built up is tolerable, even then, the issue lies with the stress and strain put on the motor. If the motor is unusually warm, check for proper shimming or shorts in the gearbox/wiring. Heat generation is contributed more to increased strain on the motor.

As for heat vents, they CAN work, but not so much if you don't have a heat sink base plate that has open vents. For example, standard M4 pistol grips have a base plate that might be fully sealed, causing positive pressure inside (because hot air expands, the air would push out from the motor and stay inside the pistol grip which results in stale air). You want NEGATIVE pressure (air going out) to alleviate the heat. Since there's very little air moving in and out of the pistol grip, there's unfortunately very little you can do other than adding a ventilated base plate to let in fresh air.