I use black plastic shim stock. It is color coded based on thickness. The black color is .012" thick and that's the color I chose. It's light weight and stiff enough to do it's 
job. I attach it to the barrel with masking tape formed into double
sided tape. It comes in 12" x 24" sheets as I recall. I cut into 3"
strips and cut the lengths as
required to fit. Works well for me.
				
			job. I attach it to the barrel with masking tape formed into double
sided tape. It comes in 12" x 24" sheets as I recall. I cut into 3"
strips and cut the lengths as
required to fit. Works well for me.
 
	









 
			 
			
 
 
		 
 
		
