Here's my recommendation:    Put down some tape where you want the hole.    Draw a circle that represents the hole (trace the Kessil using a Sharpie).     Now either cut out the majority of the hole with a hole saw or cut out the majority of the hole using a saber saw.    Cut close to the line, but not right on it.     Now use a power rasp to take away the needed plastic, right up to the line.   Sand to make it look pretty.
Here's what I have.....a 3 1/2 inch hole saw, and two power rasps. Hope this helps.
	 
	
		
			
		
		
	
			
			Here's what I have.....a 3 1/2 inch hole saw, and two power rasps. Hope this helps.
 
 
					
				
 
 
		 
 
		 
 
		










