Remove the grips, and you'll see that there is a pin though the frame at the bottom of the safety lever. The spring is about in the middle, between the frame and lever.

Put a rubber band around the grip to secure the safety lever in position, and drive out the pin with a punch. Release the lever and remove the spring from its recess. Take a good diagonal cutter, and lop off a coil or two of the spring. Check for function.

That's how I did mine.

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Tom